害人之心不可有，防人之心不可无

害人之心不可有，防人之心不可無
hàirénzhīxīnbùkěyǒu,fángrénzhīxīnbùkěwú
refrain from hurting others, yet guard against those trying to hurt you (proverb)

CEDICT

Entry Composition

1 害人 hàirén
  1. to harm sb
  2. to inflict suffering
  3. to victimize
  4. pernicious
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
3 心 xīn
  1. heart
  2. mind
  3. intention
  4. center
  5. core

classifiers: 顆, 個
4 不可 bùkě cannot; should not; must not
5 有 yǒu
  1. to have; there is
  2. (bound form) having; with; -ful; -ed; -al (as in 有意 yǒuyì intentional)
6 防人之心不可无 fángrénzhīxīnbùkěwú You will not survive in life unless you are on guard against those would harm you.