Let your yea be yea and your nay be nay.

是就是，非就非。

Let things take their course.

顺其自然。

Beauty is but skin-deep. 

红颜易变。

Let the hands get busy, not the mouth.

手要勤劳，嘴莫多说。

A still tongue makes a wise head. 

智者寡言。

Let the dead bury the dead.

往事不重提。

Of all wars, peace is the end.

一切战争终将以和平告终。

Let the cobbler stick to his last.

安分守己。