A wise man gets more use from his enemies than a fool from his friends.
Baltasar Gracian

Truth of a modest sort I can promise you, and also sincerity. That complete, praiseworthy sincerity which, while it delivers one into the hands of one's enemies, is as likely as not to embroil one with one's friends.
Joseph Conrad

There is nothing nobler or more admirable than when two people who see eye to eye keep house as man and wife, confounding their enemies and delighting their friends.
Homer

We experience problem-solving sessions as war zones, we view competing ideas as enemies, and we use problems as weapons to blame and defeat opposition forces. No wonder we can't come up with real lasting solutions!
Margaret J. Wheatley

I have written on all sorts of subjects... yet I have no enemies; except indeed all the Whigs, all the Tories, and all the Christians.
David Hume

The wise learn many things from their enemies.
Aristophanes

Men of sense often learn from their enemies. It is from their foes, not their friends, that cities learn the lesson of building high walls and ships of war.
Aristophanes

You see, we are here, as far as I can tell, to help each other; our brothers, our sisters, our friends, our enemies. That is to help each other and not hurt each other.
Stevie Ray Vaughan

A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.
Alexandre Dumas

Pay attention to your enemies, for they are the first to discover your mistakes.
Antisthenes

Observe your enemies, for they first find out your faults.
Antisthenes

The last of our enemies is laid low.
Clement Attlee

Even a paranoid can have enemies.
Henry A. Kissinger

As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.
Diogenes

Enemies, as well as lovers, come to resemble each other over a period of time.
Sydney J. Harris

You can calculate the worth of a man by the number of his enemies, and the importance of a work of art by the harm that is spoken of it.
Gustave Flaubert

Cheney is a terrorist. He terrorizes our enemies abroad and innocent citizens here at home indiscriminately.
Alec Baldwin

I hate admitting that my enemies have a point.
Salman Rushdie

If those who are the enemies of innocent amusements had the direction of the world, they would take away the spring, and youth, the former from the year, the latter from human life.
Honore de Balzac

Our most bitter enemies are our own kith and kin. Kings have no brothers, no sons, no mother!
Honore De Balzac