無風不起浪 (mou4 fung1 bat1 hei2 long6) — there are no waves without wind in Cantonese
mouˎ₄無fungˉ¹風batˉ¹不heiˊ²起longˍ₆浪简 无风不起浪
Mandarin Pinyin: wu2 feng1 bu4 qi3 lang4
Meaning of 無風不起浪
nounthere are no waves without wind
nounno smoke without fire; everything has its seed