The higher up, the greater the fall.

爬得高，摔得惨。

The leopard cannot change its spots.

本性难移。

The more noble, the more humble.

人越高尚，越谦虚。

The more wit, the less courage.

初生牛犊不怕虎。

The outsider sees the most of the game.

旁观者清。

The pen is mightier than the sword.

笔能杀人。

The pot calls the kettle black.

五十步笑百步。

There are spots in the sun.

太阳也有黑点。

There are two sides to every question.

问题皆有两面。

There is a skeleton in the cupboard.

家家有本难念的经。