Principle and Phenomenon: Two Faces of One Truth
Exploring the profound meaning of "principle" and "phenomenon" in Buddhism, and why they are not merely theory and practice.

The words "principle" and "phenomenon" sound familiar yet strange. People often say: "He practices according to principle, she practices according to phenomenon." But do you truly understand their meaning in Buddhism? Master Thích Chân Quang devoted a fascinating dharma talk to clarifying this — a talk meant not only for those newly entering the path, but also for long-time practitioners who wish to look back upon their own journey.
The Principle Nature — The Silent, Unmoving Emptiness of the Mind
In Buddhism, "principle" no longer means reasoning or theory. Master Chân Quang explains clearly: "Principle means the principle nature. The principle nature refers to the qualities of the true essence — such as Buddha nature, the dharma body, and self nature." It is the pure mind, free of discrimination, unmoving. Those who practice according to principle strive to keep the mind from arising in discrimination, seeing all things as empty and silent, illusory yet real. They look at life through the eyes of one who has "seen" the empty nature of all phenomena.
The Master also recounts a Zen story that startles us: The Venerable Zhàozhōu held a cat and cut off its head before the assembly. People were horrified, but he was testing his disciples' minds to see whether discrimination still remained. This was a manifestation of absolute principle, where there is no room for concepts of life and death, love and hate. Surely many will find this somewhat "frightening," but this is how Zen masters shatter the inverted views of sentient beings.
The Phenomenon Aspect — Wholesome Conduct, Courtesy, and Compassion
In contrast, "phenomenon" refers to concrete actions: charity, humility, courtesy, and consideration for others. Those who practice according to phenomenon are always mindful of cause and effect (karmic law), of hierarchy and order, of responsibility to the community. When they meet their teacher, they press their palms together, bow their heads, and offer greetings; when they see someone suffering, they recognize they have more than enough and share what they have. This requires discrimination — but discrimination in order to love, in order to help, not to measure who is better or worse.
"Meeting the teacher, one presses palms together and bows: 'Venerable Sir, your disciple has just arrived.' This means that one who practices according to phenomenon is humble, courteous, and proper in manner."
The Master adds that if one practices according to "principle" without phenomenon, one may become dry and rigid, even eccentric. But if one practices according to "phenomenon" without principle, one easily falls into attachment, caring only for outward appearances.
Principle and Phenomenon — Seemingly Opposite, Yet One
At first glance, principle and phenomenon appear to be opposites: principle is without discrimination, while phenomenon involves discrimination; principle sees oneness, while phenomenon distinguishes levels and order. But Master Chân Quang says this is only the view of those who do not yet understand correctly. In deep realization, one sees that principle and phenomenon are not two — like shadow and form, like water and waves. Those who practice according to principle need compassionate conduct; those who practice according to phenomenon need the contemplation of emptiness.
"Principle creates a style of ease and freedom, while phenomenon creates an attitude of devoted attentiveness. The two differ in that way. Yet both are qualities of the Buddha's way."
Try looking at yourself: at one moment, you may be able to keep the mind unmoving, and then the very next moment, seeing an elder walk in, you hurriedly rise to greet him. Are these truly contradictory? That is principle and phenomenon flowing together in the same river of the mind.
Practice, in the End, Is Simply Seeing One's Faults
Perhaps the most important point in the Master's talk is this: practice is not about becoming enchanted with lofty, mystical matters — in the end, it is simply about seeing one's own faults. The deeper we practice, the more we see our own subtle errors. New practitioners see faults like anger and jealousy; those who have practiced longer see deeper faults, such as the subtle self-attachment still hidden within meditative concentration.
"Practice, taken to its very end, is simply seeing one's faults."
"Don't try to see anything else — just strive to see your faults."
So do not be swayed by lofty-sounding terms. Be clear-minded, calm, and examine yourself. Each day you see one small fault is another day you advance one step on the path to liberation.
The Scriptures — The Gate of Principle and the Gate of Phenomenon
Within the treasury of scriptures, there are texts that lean toward principle, such as the Diamond Sutra, the Prajñā texts, and Madhyamaka — speaking of absolute emptiness; and there are texts that lean toward phenomenon, such as the Nirvana Sutra, the Lotus Sutra, and the Sutra on Bequeathed Teachings — speaking of conduct, attainment, and keeping precepts. Master Chân Quang also reveals that the Prajñā wisdom was attained by the patriarchs through genuine realization, so even though these texts were not historically spoken by the Buddha, they are still blessed by all the Buddhas because they express the Buddha's true intent.
But only with understanding and practice can the scriptures truly be applied. The Master once said: if you print and distribute a sutra that the reader does not understand and cannot benefit from, there is no merit at all. So rather than chasing quantity, pursue the quality of understanding.
Master Chân Quang's dharma talk does not open up a dry edifice of theory, but extends an invitation to return to ourselves. Begin today: when listening to a talk or chanting sutras, ask yourself: "Am I practicing according to principle or according to phenomenon?" And more importantly: "Am I truly seeing my own faults?"
AI-assisted translation from the Vietnamese original.
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