A stitch in time saves nine. 
及時一針省九針。及時行事，則事半功倍。

A tree is known by its fruit. 
從所結的果子可以知道一棵果樹的好壞。

Actions speak louder than words. 
行動勝於言辭；事實勝於雄辯。

Advice when most needed is least heeded. 
忠言逆耳。

After rain comes sunshine. 
雨過天晴。