害人之心不可有，防人之心不可无
hài​rén​zhī​xīn​bù​kě​yǒu​fáng​rén​zhī​xīn​bù​kě​wú

one should not intend to harm others but must be on guard against harm from others

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 hài​rén​zhī​xīn​bù​kě​yǒu​fáng​rén​zhī​xīn​bù​kě​wú
one should not intend to harm others but must be on guard against harm from others
(proverb) One should not have the intention to harm people, yet one must not be without a heart that guards against the harm others might do.