自知之明

zìzhīzhīmíng
(idiom) self-knowledge

CEDICT

wisdom of self-knowledge

Wiktionary

语本《老子．第三三章》：「知人者智，自知者明。」指能清楚的了解自身的能力、优缺点，即对自己有正确的认识。

重編國語辭典

对自己（能力、优点、缺点等方面）有清楚的认识

維基詞典

Entry Composition

1 自知 zìzhī
  1. to be personally aware
  2. to know thyself
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
3 明 míng
  1. bright
  2. opposite: dark 暗 àn
  3. (of meaning) clear
  4. to understand
  5. next
  6. public or open
  7. wise
  8. generic term for a sacrifice to the gods