Lookers-on see most of the games.

旁观者清。

Never judge by appearances.

人不可貌相。

Poison is poison though it comes in a golden cup.

纵然装入金杯，毒药还是毒药。

Seeing is believing.

眼见为实。

The great fish ear up the small.

弱肉强食。

The more things a man is ashamed of the more respectable he is.

一个人引以为耻的事情越多，就越可尊敬。