Any non-commissioned officer is more of an enemy to a recruit, any schoolmaster to a pupil, then they are if they were free.
I am a pupil of Pissarro.
Friends are enemies sometimes, and enemies friends.
You can learn from anyone even your enemy.
A friend is one who has the same enemies as you have.
Let my enemies devour each other.
If you don't have enemies, you don't have character.
I have no friends and no enemies - only competitors.
Always forgive your enemies - nothing annoys them so much.
Reason is the enemy of faith.
Enemies' gifts are no gifts and do no good.
Observe your enemies, for they first find out your faults.
Am I not destroying my enemies when I make friends of them?
I destroy my enemies when I make them my friends.
Better is the enemy of good.
The best is the enemy of the good.
Poverty is the schoolmaster of character.
Man has no greater enemy than himself.
Isn't it the sweetest mockery to mock our enemies?
The wise learn many things from their enemies.
We often give our enemies the means for our own destruction.