A wise enemy is better than a foolish friend

Similar English and Irish sayings:

Treat your friend as if he might become an enemy Treat your friend as if he might become an enemy
One enemy is too many; and a hundred friends too few One enemy is too many; and a hundred friends too few
Speak well of your friend, of your enemy say nothing Speak well of your friend, of your enemy say nothing

Proverbs and English sayings