青出于蓝
qīng chū yú lán The Student Surpasses the TeacherIndigo is made from the indigo plant, yet it is bluer than the plant itself. Xunzi's image for the student who surpasses the teacher through sustained effort.
Source · 来源 láiyuán
The phrase comes from the opening lines of 劝学 (Quàn xué, "Encouraging Learning"), the first and most famous essay of the Xunzi, the collected writings of the Confucian philosopher Xunzi (313–238 BCE). The original passage reads:
青，取之于蓝，而青于蓝；冰，水为之，而寒于水。
(Qīng, qǔ zhī yú lán, ér qīng yú lán; bīng, shuǐ wéi zhī, ér hán yú shuǐ.)
"Indigo is extracted from the indigo plant, yet it is bluer than the plant. Ice is made from water, yet it is colder than water."
Xunzi uses these images to open his argument that human beings can be transformed by sustained learning and practice. Just as a raw material can be refined into something superior to its source, a person shaped by proper education and ritual practice can surpass those who instructed them. This was a direct answer to the intuition that a student can never fully transcend their teacher or their origins. For Xunzi, who argued that human nature is raw and requires active cultivation rather than merely being unfolded, the image is foundational: what you become is not given in what you are.
The full essay is paired naturally with 学 · to learn, the character at the center of Confucian self-cultivation, and with 老 · old age, whose entry treats the teacher-student transmission that gives knowledge its continuity across generations. For the philosophical context of Xunzi's argument about human nature, see 荀子 · Xunzi.
Meaning · 含义 hányì
The full form of the chengyu is 青出于蓝而胜于蓝 (qīng chū yú lán ér shèng yú lán): "indigo comes from the indigo plant and yet surpasses the indigo plant." The four-character compression 青出于蓝 carries the complete thought in conversation; the longer form is preferred in writing when precision matters.
The phrase is used to praise a student, apprentice, or successor who has exceeded their teacher or predecessor. It carries no condescension toward the teacher — the image of the indigo plant is not one of failure but of productive source. The teacher made the transformation possible. The phrase acknowledges that the relationship produced something beyond itself.
There is a companion phrase, 后来居上 (hòulái jū shàng, "the latecomer rises to the top"), that covers similar ground but without the teacher-student frame. 青出于蓝 is specific to learning and transmission; 后来居上 can apply to any competition where a newcomer surpasses an established figure.
Usage · 用法 yòngfǎ
The most common use. Said by a teacher about their student, or by observers of someone who has clearly exceeded the person who trained them. The tone is warm and slightly proud, not surprised. It assumes the surpassing was expected as the proper outcome of serious learning.
Used when a younger generation of professionals, artists, or scholars outperforms the generation that trained them. In this context it can be said by the older generation about the younger with genuine admiration, or by the younger generation about their own cohort, though the latter can read as immodest.
他的学生已经青出于蓝了，比他当年写得还好。(Tā de xuésheng yǐjīng qīng chū yú lán le, bǐ tā dāngnián xiě de hái hǎo.) — His student has already surpassed the teacher — writes even better than he did in his day.
Character Analysis · 字解 zìjiě
Blue-green; the color between blue and green that Chinese tradition does not divide. Also: indigo, the dye. In classical usage, 青 covers the spectrum of living, growing colors — the blue of the sky, the green of spring growth, the dark indigo of a dyed robe. The ambiguity between blue and green is built into the character and is not a linguistic limitation but a different carving of color space.
To come out, emerge, go beyond. The character shows a plant growing up from soil. In this phrase, 出 carries both the literal sense (extracted from) and the figurative sense (going beyond the source). The movement is from inside to outside, from contained to expressed.
From, in, at, than. A classical preposition with several functions. Here it appears twice in the full phrase: 取之于蓝 (extracted from the indigo plant) and 青于蓝 (bluer than the indigo plant). The same character marks source and comparison simultaneously — a compression that works in classical Chinese but requires different English words to translate the two instances.
The indigo plant (Indigofera tinctoria); also the color blue derived from it. The plant produces a green pigment in its leaves that becomes blue-indigo through oxidation during the dyeing process. Xunzi's image is precise: the transformation from plant to dye is real and chemical, not metaphorical. The resulting indigo is measurably, visibly bluer than the source leaf.