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It's good for everyone to understand that they are to love their enemies, simply because your enemies show you things about yourself you need to change. So in actuality enemies are friends in reverse.

Man's wisdom is his best friend; folly his worst enemy.

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.

Anyone who is an enemy of mine, let him love women, but let he who is my friend rejoice in men.

A man can't be too careful in the choice of his enemies.

He will never have true friends who is afraid of making enemies.

Instead of loving your enemies - treat your friends a little better.

Nothing would more contribute to make a man wise than to have always an enemy in his view.