What Is Zen Buddhism? The Most Comprehensive Overview

1. What Is "Chan"?

The term "Chan" is the condensed expression of the core essence of dhyana (meditative absorption). Its roots trace back to the Sanskrit term dhyana, which translates to Chinese as denoting the state of "cultivation of thought" and "calm contemplation." As one of the six paramitas (perfections) of the bodhisattva path, it symbolizes a profound method of spiritual cultivation. Today, when we refer to "Chan," we most often mean the Chan practice transmitted within the Chan school, which shares common ground with the "dhyana" of the six paramitas while possessing its own distinctive characteristics. Dhyana is one of the oldest spiritual practices, having flourished in India even before the birth of Buddhism. In propagating the Dharma, the Buddha established "precepts, dhyana, and wisdom" as the threefold foundation of study—an indispensable cornerstone for every Buddhist practitioner. When Buddhism entered China, generations of patriarchs and all schools took "dhyana" or "Chan contemplation" as the foundation of their practice and the cornerstone of their respective schools' founding.

The Sixth Patriarch of Chan Buddhism, Master Huineng, once said: "To 'sit' is for the mind to not arise in response to any external good or bad circumstances; to be in Chan is to inwardly perceive one's inherent nature as unmoved. Freedom from external attachment to forms is Chan; inner freedom from turmoil is dhyana. If one clings to external forms, the mind is disturbed; if one is free from external forms, the mind remains undisturbed. One's fundamental nature is inherently pure and settled by itself. If one encounters all circumstances yet the mind stays undisturbed, this is true dhyana." These profound words reveal the true meaning of Chan: in the bustling secular world, maintaining inner tranquility and purity, undisturbed by external things, and not deluded by appearances. From a modern perspective, "Chan" is more akin to an art of "meditation"—through meditative practice, we gradually enter the state of dhyana. Yet the essence of Chan cannot be fully expressed in words; it requires personal practice, experience, and direct realization. Only through direct personal realization can we perceive the profound and vast world of dhyana and grasp the wisdom and tranquility it brings.

(The Buddha during ascetic practice) In 563 BCE, the founder of Buddhism, Siddhartha Gautama Buddha, was born. According to Buddhist tradition, the Buddha was born a prince. Stirred by the suffering of aging, illness, and death, he renounced his royal life to practice, and ultimately attained awakening as a "Buddha." This religion has exerted a profound influence on subsequent generations. He meditated in the posture of dhyana, contemplating the suffering of the world.

2. What Is "Chan Buddhism"?

"Chan Buddhism," this illustrious school in the history of Chinese Buddhism, has stood uniquely in the religious landscape since the founding patriarch Bodhidharma established the tradition. Patriarch Bodhidharma, revered as the 28th patriarch in the Chan transmission lineage, was akin to a navigator who, during the reign of Emperor Wu of Liang of the Southern Dynasties, braved wind and waves to cross the ocean and arrive in Guangzhou. Subsequently, at the end of the Northern Wei Dynasty, he spread the seeds of Chan in the Luoyang region, guiding sentient beings with the "two entrances and four practices" of Chan cultivation, and taking the Lankavatara Sutra as his core doctrinal text. From its very inception, Chan Buddhism has centered on dhyana to explore the true meaning of life. Disciples such as Huike and Sengcan, like runners in a relay race, passed down the wisdom of Chan generation after generation. Daoxin, a disciple of Sengcan, established the Dongshan Dharma Gate and was revered as the Fifth Patriarch of Chan. His disciples spread to the two capitals, propagating the Dharma and gaining widespread renown for a time.

In the long river of Chan history, the two masters Shenxiu and Huineng stood like brilliant stars, dividing into the Northern School of gradual cultivation and the Southern School of sudden enlightenment, together illuminating the sky of Chan. Master Shenxiu of the Northern School advocated gradual cultivation. In his later years, he entered the capital and was honored as the imperial teacher of three emperors. Though his disciples Puji and Yifu transmitted the teachings for several generations, the school gradually declined. Master Huineng of the Southern School, with his vast wisdom and profound cultivation, became the orthodox lineage of Chan. He resided at Caoxi Baolin Temple in Shaozhou, where throngs of disciples gathered, all recognizing him as the Sixth Patriarch and venerating him deeply. Master Huineng based his teachings on the Lankavatara Sutra, Diamond Sutra, and Awakening of Faith in the Mahayana, revealing the true meaning of the Buddha's Dharma to sentient beings. His magnum opus, the Platform Sutra of the Sixth Patriarch, is a treasure of Chan, with boundless wisdom and power woven between its lines.

3. What Is the Sixteen-Word Profound Principle of Chan Buddhism?

The sixteen-word profound principle of Chan Buddhism—"not establishing words, transmission outside the teachings, directly pointing to the human mind, seeing nature and becoming a Buddha"—seems like an invisible gate of wisdom, leading sentient beings to explore the mysteries deep within their hearts. In the Jingde Record of the Five Lamps, "The Seven Buddhas, Shakyamuni Buddha," compiled by Song Dynasty monk Puji, it is recorded that on Vulture Peak, the World-Honored One held up a golden lotus flower to present to the assembly, prompting deep contemplation among all. At that moment, all were silent, and only Venerable Mahakashyapa broke into a smile, his mind in perfect communion with the Buddha's, conveying boundless wisdom and Chan meaning in silence.

The World-Honored One praised him, saying: "I have the treasury of the true Dharma eye, the wonderful mind of Nirvana, reality that has no form, and the subtle Dharma gate. Not establishing words, transmission outside the scriptures, I entrust this to Mahakashyapa." These brief yet profound words were like a key, opening the Dharma gate for Mahakashyapa to inherit the Buddha's robe and bowl. The robe and bowl, as symbols of Dharma transmission in Buddhism, carry the wisdom and compassion of the Buddha. The Blue Cliff Record also contains a story about Patriarch Bodhidharma. Perceiving the great flourishing of Mahayana potential in this land, he decided to cross the ocean to come here and propagate the Dharma. He transmitted the mind seal alone, instructing lost sentient beings, using the method of "not establishing words, transmission outside the teachings" to directly point to the human mind and guide beings to see their nature and become Buddhas. These two Buddhist legends together explain the profound meaning of the sixteen-word principle of Chan Buddhism. This wordless communion of mind, like the mind-to-mind connection between Mahakashyapa and the Buddha on Vulture Peak, requires no words—only a smile to realize the true meaning of life. Shakyamuni's Dharma words to Mahakashyapa are the best interpretation of this state of mind.

4. What Is "Transmission Outside the Scriptures"?

"Transmission outside the scriptures," this unique term in the Chan community (also called "single transmission"), is as evocative as poetry and painting, concealing boundless profundity. It signifies a realization that transcends the bondage of words and language, directly reaching the Buddha's state of awakening. The transmission between Chan master and disciple cannot be fully expressed in words; it is an extraordinary practice of mind-to-mind transmission, with intuitive spiritual connection. This method of Dharma transmission differs from traditional scriptural teachings, hence the name "transmission outside the scriptures." Another elegant name for Chan Buddhism, the "Special Transmission School," is also a condensed reference to this "transmission outside the scriptures." This transcendent Chan Dharma was founded by the great Patriarch Bodhidharma as Patriarch Chan. The "Buddha holding up a flower" parable is the quintessential illustration of the characteristics of Chan Dharma transmission. It both demonstrates the solemnity and sanctity of authentic Dharma transmission, and embodies the transcendence of written language, directly seeing the mind ground and realizing the ultimate truth.

According to the Record of the Patriarch's Courtyard Affairs, Volume 5, the Preface by Master Huai, at the beginning of Chan transmission, the patriarchs also used the Tripitaka (the three baskets of Buddhist canon) to guide disciples. However, starting with Patriarch Bodhidharma, he pioneered the single transmission of the mind seal, breaking attachment to reveal the school, and established the profound principle of "not establishing words, transmission outside the scriptures, directly pointing to the human mind, seeing nature and becoming a Buddha." Since then, the mystery of Chan has been revealed through the interpretation of "not establishing words, transmission outside the scriptures." Another view holds that "transmission outside the scriptures" is treated with such gravity precisely to avoid misinterpretation of the essential meaning of the Buddha's Dharma during the transmission process, thereby ensuring the purity and sanctity of Chan. The Buddha's teaching through "words" and "phrases," relying on language, is the Dharma within the scriptures; while apart from "words" and "phrases," directly imprinting the Buddha's mind in the heart, is the Dharma outside the scriptures. Hence the famous saying "looking to the mouth is the teachings; looking to the mind is called Chan" has been passed down through the ages, becoming the essence of Chan.

5. Does Chan Buddhism Truly "Not Rely on Words"?

After the Sixth Patriarch Huineng, Chan Buddhism vigorously promoted the method of sudden enlightenment, advocating mind-to-mind transmission, transcending the bondage of written language, and was praised by the world as the school that "does not rely on words." The Buddha said: "To speak of the Dharma is not the Dharma; it is merely called the Dharma." Master Huineng also said: "To describe it as a concrete thing is to miss it." However, the world has deeply misunderstood Chan Buddhism's "not establishing words, transmission outside the scriptures," often thinking it means completely abandoning words, or even abandoning Buddhist principles, which is actually a grave error. When Patriarch Bodhidharma propagated the Dharma in China, he also used the Lankavatara Sutra as his teaching text; Master Huineng's disciples mainly used the Diamond Sutra and the Awakening of Faith in the Mahayana as their doctrinal basis; and the Platform Sutra of the Sixth Patriarch, Master Huineng's own representative work, has been passed down through the ages. From this, it can be seen that Chan Buddhism has had written works in every generation. "Not establishing words" does not mean that Chan Buddhism has no textual classics.

Since the birth of Chan Buddhism, there have been numerous lamp records and koans as numerous as mountains. How could the transmission of teachings ever be separated from the assistance of words? During and after the Tang and Song dynasties, Chan Buddhism compiled a large number of recorded sayings, lamp records, and other written materials, using "words" as a medium to interpret the profound principle of "not establishing words, transmission outside the scriptures, directly pointing to the human mind, seeing nature and becoming a Buddha." Even those seemingly mysterious "shouts and strikes" are merely special forms of body language and expressive tools used to awaken intelligence and open enlightenment. The path to becoming a Buddha, while fundamentally unrelated to words and language, does not require deliberate separation from words.

(Diamond Sutra scroll)

In fact, whether it was the Lankavatara Sutra used by Bodhidharma when teaching in China, the Diamond Sutra and Awakening of Faith in the Mahayana that served as the main doctrinal bases for Huineng's disciples, or the Platform Sutra of the Sixth Patriarch representing Huineng's Chan theory, all demonstrate that Chan Buddhism has had transmitted texts in every generation. Therefore, Huineng's advocacy of "not establishing words" does not mean that Chan Buddhism lacks textual classics.

6. What Other Names Does Chan Buddhism Have?

Chan Buddhism, this time-honored and profound Buddhist school, is also called the Bodhidharma School and the Buddha-Mind School, shining brilliantly through the long course of history. When it first entered China, Patriarch Bodhidharma traveled alone across thousands of rivers and mountains, finally arriving at Shaolin Temple on Song Mountain, where he practiced dhyana in seclusion and deeply realized the Buddha's Dharma. In the depths of the temple, there were two monks, Daoyu and Huike, who with sincere devotion revered Patriarch Bodhidharma like a deity, serving at his side for four or five years. Seeing their sincere minds and firm resolve, the patriarch joyfully transmitted the true meaning of Chan Buddhism to them and gave Huike four volumes of the Lankavatara Sutra. The patriarch said: "I observe that the Chinese people's spiritual capacity is most suited for cultivating this sutra. If you practice accordingly, you can transcend the disturbances of the secular world."

The patriarch also established the sixteen-word maxim as the essence of Chan Buddhism: "not establishing words, transmission outside the teachings, directly pointing to the human mind, seeing nature and becoming a Buddha." Later, through the vigorous propagation of successive generations of eminent monks—the Second Patriarch Huike, Third Patriarch Sengcan, Fourth Patriarch Daoxin, Fifth Patriarch Hongren, and Sixth Patriarch Huineng—Chan Buddhism finally blossomed like a flower with five petals, becoming the largest school of Chinese Buddhism. Later generations, in honor of Patriarch Bodhidharma's merit, revered him as the First Patriarch of Chan Buddhism; hence Chan Buddhism also came to be called the Bodhidharma School. In the transmission of Chan Buddhism, the Dharma was not passed down through written words but confirmed through mind-to-mind transmission, known as "the transmission that a thousand sages do not transmit." Thus, in the scriptural transmission of Chan Buddhism, all written records must be carefully weighed and rigorously examined. Although there may be disputes over different accounts in the transmission process, the root of Chan Dharma transmission all stems from Venerable Mahakashyapa's mind-to-mind reception of the Buddha's state of perfect enlightenment. Chan disciples all claim to have received the Buddha's mind seal; hence they are also called the Buddha-Mind School.

Venerable Mahakashyapa was the Buddha's most favored disciple. With an honest, unassuming appearance and deep-set eyes, he was a typical figure of an elderly Northern Indian ascetic. After being transformed by the World-Honored One, he became "foremost in ascetic practices," and later became the earliest master in Chan Buddhism due to his tacit understanding of the "flower and smile" episode.

7. What Is the Essence of Chan?

To deeply explore the mysteries of "Chan," one must first understand the profound meaning behind the character. Chan is actually an art of exploring the true meaning of life, like a painter with unique insight who uses the brush of the mind to outline the essential picture of life. The essence of "Chan" is a wisdom path for penetrating the source of life. It aims to liberate the bound mind and lead us to the supreme state of "when the mind is calm, the land is pure." In this process, Chan practitioners cultivate and refine their nature through ascetic practices, meditation, and patience, restraint, and resistance to temptation in daily life, to achieve harmony and balance of body and mind.

The mind state of a Chan practitioner is like the all-accommodating sky, boundless and vast. Through thorough observation of all phenomena in the world, they perceive the true nature of external things and the inner world, thereby entering a noble, calm, and natural state. In this state, they transcend the bondage of samsara, the mundane world, and the cycle of karma, obtaining true freedom. However, for practitioners of Chan, the "Chan" in Chan Buddhist practice cannot be fully explained in words. Chan Buddhism believes that the essence of "Chan" is formless and without inherent characteristics. Once one tries to describe it in words, one has already deviated from the true meaning of Chan. Therefore, Chan practitioners on the path of cultivation more often realize the mysteries and wisdom of "Chan" through inner realization and practice. In summary, Chan is an art of penetrating the essence of life, leading us to inner peace and freedom. On the path of cultivation, we may not be able to fully explain the essence of "Chan" in words, but as long as we realize and practice it with our hearts, we can gradually appreciate the wisdom and charm of Chan.

8. What Are the Characteristics of Chan?

The characteristics of "Chan" discussed here specifically refer to the unique "Chan" of Chan Buddhism. Since the rise of Chan Buddhism, the "Chan" it advocated has both commonalities with the earlier "Chan contemplation" or "dhyana" while also displaying distinctive differences. The traits of Chan determine that its cultivation methods are unique and completely distinct from those of other schools.

First, the "Chan" of Chan Buddhism is actually a profound cognitive practice. It is not the "dhyana perfection" among the six paramitas, but tends more toward the "wisdom perfection." On the cultivation path, it emphasizes independent undertaking, self-seeking, and self-completion—this is the most prominent trait of Chan. Second, Chan Buddhism places special emphasis on direct dialogue between master and disciple, aiming to spark the wisdom of the student. Through this method, students can realize the true meaning of Chan in the collision of ideas. Furthermore, Chan Buddhism emphasizes enlightenment as the primary step of practice. It believes that only through "cultivation after enlightenment" can one achieve twice the result with half the effort. Chan requires the pursuit of self, and its process and means often defy conventional logic, yet often become the only path to becoming a Buddha.

Additionally, Chan Buddhism does not separate itself from daily life. It closely integrates cultivation with the purification of daily life, believing that "the ordinary mind is the Way" and "the Buddha's Dharma is in the world, not apart from the world's awakening." This attitude of engaging in worldly affairs with a transcendent spirit is precisely the essence of Chan Buddhist practice. Finally, Chan also possesses a sense of humor. Those who study Chan must have insight and resourcefulness, and a sense of humor is an indispensable part of this. The patriarchs in history were all masters of humor. In humor, Chan naturally reveals itself.

9. What Is the Ultimate Goal of Chan Buddhist Practice?

Chan Buddhism, whose essence lies in the deep excavation and application of the mind-nature, aims to penetrate all phenomena and illuminate the mind to see one's true nature. The path of Chan Buddhist practice is particularly characterized by the unity of meditation and wisdom, displaying the unique charm of Buddhist practice. In contemporary Chinese Buddhist academia, Chan Buddhism undoubtedly stands at the pinnacle, and its practice method—dhyana—is hailed as the supreme method and state of Buddhist cultivation. During dhyana, the consciousness can deeply enter the state of ultimate emptiness and profound stillness, feeling the peace and wisdom arising from the depths of the heart. The Prajnaparamita Sutra says: "When one thought does not arise, prajna is born." When the mind is extremely pure and not a single thought arises, this is the state where the eighteen realms are all empty. At this moment, the body is like the fruit of the bodhi tree, and the mind is like the source of spiritual wisdom. Buddhism holds that this supreme state can only be realized by sages.

From the perspective of Chan Buddhist thought, the description in the Prajnaparamita Sutra of "not arising, not ceasing, not defiled, not pure, not increasing, not decreasing, prajna contemplating freely, able to eliminate all suffering" constitutes an expression of infinite admiration and absolute affirmation of the Chan Buddhist prajna view of emptiness. Prajna occupies a supremely noble position in Chan Buddhism, hailed as the mother of all Buddhas. Only by using prajna wisdom to resolve the suffering of life can one achieve the state of perfect bodhi. The ultimate goal of Chan Buddhist practice is the Nirvana expounded by the Buddha. The state of Nirvana is a realm that extinguishes greed, hatred, delusion, ignorance, wrong views, distinctions of right and wrong, and afflictions, silent and unstained, with self and other both forgotten, luminous and perfect, free and unobstructed. It transcends the bondage of life and death and is the ultimate state of the realized realm. If one can enter the state of Nirvana, this is true liberation and transcendence in life.

10. What Is the Philosophical Foundation of Chan Buddhist Thought?

The cornerstone of Chan Buddhist philosophical thought originates from the integration of Indian Buddhist philosophy with Chinese Confucian and Daoist philosophical worldviews. Its emergence is like a towering ancient tree, with Buddhist thought as its trunk and roots, while the fragrance of Daoist and Confucian thought blooms among its branches. Looking back at the long river of history, generations of Chan masters have drawn on the Lankavatara Sutra, Nirvana Sutra, Lotus Sutra, Prajnaparamita Sutra, Vimalakirti Sutra, Diamond Sutra, Avatamsaka Sutra, Shurangama Sutra, and Awakening of Perfect Enlightenment Sutra to sow the seeds of wisdom. This is a vivid embodiment of the pluralistic blending of its thought.

In the process of the formation of Chinese Chan Buddhist philosophy, several Buddhist scriptures such as the Lankavatara Sutra, Vimalakirti Sutra, Diamond Sutra, and Nirvana Sutra are like bright lamps illuminating the path forward. They are not only treasuries of wisdom but also important cornerstones for the formation of Chan Buddhist thought. Chan Buddhism and Daoist thought resonate with each other like harmonious stringed instruments in the three aspects of "no mind, no thought, no speech." Chan philosophy, as a unique philosophical form, contains rich ontological and epistemological ideological connotations while displaying unique methodological characteristics, which bears similarities to Daoist philosophy. Chan philosophy firmly believes that "the ultimate truth cannot be spoken," so its ideological method often carries the charm of intuitive thinking or aesthetic contemplation, like hazy moonlight,朦胧 yet more profound.

As for Confucianism, in the process of its development in China, Chan Buddhist philosophy is more like two dancers mutually illuminating each other on stage, mutually absorbing and mutually integrating, rather than a one-sided appropriation. Chan philosophy, as a Chinese form of idealism, also conducted in-depth reference and absorption of the mind-nature theory tradition since Confucius and Mencius, like streams merging into a great river, jointly composing a movement of the soul. Chan Buddhism also keenly perceives that the fundamental philosophical question is how to achieve harmony and unity between subjective thinking and objective reality. In the history of philosophy, Chan Buddhism treats this fundamental question with a serious and prudent attitude. It advocates embracing the objective with the subjective, using the mind to transcend objective forms, thereby achieving the supreme state of unity between subject and object.