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Jyutping fong4 jan4 zi1 sam1 bat1 ho2 mou4
Pinyin fáng rén zhī xīn bù kě wú

Definitions (粵典–words.hk)
  1. 語句
    需要​時常防備​其他人​謀害​自己​;​有​時會​同上​一句​「​害人​之心​不可​有​」​一齊用
    guard against those trying to harm you; sometimes used after 害人之心不可有hoi6 jan4 zi1 sam1 bat1 ho2 jau5
    • 防人之心不可無,出面個社會好複雜㗎。
      防人之心不可无,出面个社会好复杂㗎。
      fong4 jan4 zi1 sam1 bat1 ho2 mou4, ceot1 min6 go3 se5 wui2 hou2 fuk1 zaap6 gaa3.
      You'd better be aware of others. The world outside is complicated.
Definitions (Wiktionary)
  1. proverb
    You will not survive in life unless you are on guard against those would harm you.
Examples (粵典–words.hk)
  1. Cantonese
    防人之心不可无。
    防人之心不可無。
    fong4 jan4 zi1 sam1 bat1 ho2 mou4.
    • One should be vigilant against malice from others.
  2. Cantonese
    防人之心不可无,出面个社会好复杂㗎。
    防人之心不可無,出面個社會好複雜㗎。
    fong4 jan4 zi1 sam1 bat1 ho2 mou4, ceot1 min6 go3 se5 wui2 hou2 fuk1 zaap6 gaa3.
    • You'd better be aware of others. The world outside is complicated.