Related posts:
Never soar aloft on an enemy’s pinions. – Aesop
We often give our enemies the means for our own destruction. – Aesop
Faithful are the wounds of a friend; but the kisses of an enemy are deceitful. – Aesop
A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him. – Aesop