Master Yichuan
程颐
Cheng Yi
Master Yichuan
程颐
Systematizing Principle (穷理尽性): Cheng Yi developed the concept of li (理, principle) as the fundamental reality underlying all things. He argued that every phenomenon has its principle, and the investigation of these principles (格物致知) is the path to wisdom.
The Method of Reverence (主敬说): Cheng Yi emphasized jing (敬, reverence or seriousness) as the central practice of moral cultivation. Unlike his brother's emphasis on naturalness, Cheng Yi advocated careful attention, self-discipline, and maintaining a serious mind at all times.
Strict Teaching Style (严师风范): Unlike Cheng Hao's warm approach, Cheng Yi was known for his severity. He once made his student Yang Shi wait in the snow for hours — the origin of the idiom "Cheng Men Li Xue" (程门立雪, "Standing in the snow at Cheng's gate"), which became a metaphor for deep respect for one's teacher.
Commentary on the Yijing (易传): Cheng Yi wrote an influential commentary on the Book of Changes (伊川易传), interpreting it as a guide to moral cultivation rather than divination. This work became one of the most important Yijing commentaries in Chinese history.
涵养须用敬，进学则在致知。
"Nurturing character requires reverence; advancing in learning depends on extending knowledge." — The twin pillars of cultivation.
格物穷理。
"Investigate things to exhaust their principles." — The method of understanding through careful study.
性即理也。
"Nature is principle." — The identity of human nature with cosmic principle.
天下之物皆能穷，只是一理。
"All things under heaven can be exhaustively understood — there is but one principle." — The unity underlying all knowledge.
饿死事极小，失节事极大。
"To starve to death is a small matter; to lose one's integrity is a great matter." — The extreme emphasis on moral integrity.
The fundamental reality that gives structure and meaning to all things. Cheng Yi argued that principle is "one" in the sense that all principles are ultimately expressions of a single cosmic order, yet "many" in that each thing has its own specific principle.
The method of moral cultivation. Reverence is not religious devotion but a constant state of mindful seriousness — attending carefully to one's thoughts, words, and actions.
The path to wisdom through careful study of the world. By investigating the principle in things, one gradually comprehends the supreme principle.
Human nature is identical with cosmic principle. This means that the moral law is not imposed from outside but is inherent in our very being.
"Commentary on the Book of Changes" — A moral-philosophical interpretation of the Yijing that became one of the most influential commentaries.
"Surviving Works of the Cheng Brothers" — Collected writings and recorded conversations of both Cheng brothers.
"Selected Writings of the Cheng Brothers" — A curated selection of the Chengs' philosophical works.
Cheng Yi's emphasis on rigorous study and moral seriousness offers a counterbalance to modern tendencies toward superficiality. His method of "investigating things" anticipates the scientific spirit of systematic inquiry. The story of "standing in the snow at Cheng's gate" reminds us of the value of humility and dedication in learning. His insistence that integrity matters more than survival challenges us to consider what we truly value.