智者千虑，必有一失

智者千慮，必有一失
zhìzhěqiānlǜ,bìyǒuyīshī
lit. a wise person reflecting a thousand times can still make a mistake (idiom); fig. nobody is infallible

CEDICT

Entry Composition

1 智者 zhìzhě
  1. sage
  2. wise man
  3. clever and knowledgeable person
=2 千 qiān thousand
=2 千 qiān used in 秋千 qiūqiān
3 虑 lǜ
  1. to think over
  2. to consider
  3. anxiety
4 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily
5 有 yǒu
  1. to have; there is
  2. (bound form) having; with; -ful; -ed; -al (as in 有意 yǒuyì intentional)
6 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
7 失 shī
  1. to lose
  2. to miss
  3. to fail