自己知自己事

zìjǐzhīzìjǐshì

to know one's shortcomings

Wiktionary

Entry Composition

1 自己 zìjǐ
  1. oneself
  2. one's own
=2 知 zhī
  1. to know
  2. to be aware
=2 知 zhì
  1. (obsolete on its own in Standard Chinese) Original form of 智 (zhì, “knowing, wisdom, intelligence”).
  2. Original form of 智 (zhì, “knowing, wisdom, intelligence”).
3 自己 zìjǐ
  1. oneself
  2. one's own
=4 事 shì
  1. matter
  2. thing
  3. item
  4. work
  5. affair

classifiers: 件, 樁, 回
=4 事 zì
  1. alternative form of 倳 (zì, “to establish”)
  2. alternative form of 剚 (zì, “to stab”)