「知人口面不知心」

(pos:語句)
<explanation>
yue:從人嘅外表唔能夠知道佢嘅內心係點，辨別唔到佢係好人定壞人
eng:people cannot understand others from the person's appearance
<eg>
yue:知人口面不知心，呢個世界唔係咁簡單㗎。 (zi1 jan4 hau2 min6 bat1 zi1 sam1, ni1 go3 sai3 gaai3 m4 hai6 gam3 gaan2 daan1 gaa3.)
eng:You can't know people's mind from their faces. The world is not that simple.