A man may learn wisdom even from a foe.
Aristophanes
The deadliest foe of democracy is not autocracy but liberty frenzied.
Otto Hermann Kahn
The spirit's foe in man has not been simplicity, but sophistication.
George Santayana
Heat not a furnace for your foe so hot that it do singe yourself.
William Shakespeare
It would be judicious to act with magnanimity towards a prostrate foe.
Zachary Taylor
He makes no friends who never made a foe.
Alfred Lord Tennyson
The deadliest foe to virtue would be complete self-knowledge.
F. H. Bradley