“ A wise man gets more use from his enemies than a fool from his friends. ”
Source: The Art of Worldly Wisdom
Similar Quotes
The man of knowledge must be able not only to love his enemies but also to hate his friends. 
A wise man will make more opportunities than he finds. 
It is easier to forgive an enemy than to forgive a friend. 
Never explain- your friends do not need it and your enemies will not believe you anyway. 
In the end, we will remember not the words of our enemies, but the silence of our friends.