Quotes by Subject:

Enemies

He is a man of courage who does not run away, but remains at his post and fights against the enemy. – Socrates.

I am an enemy to vice, and a friend to virtue. - Benjamin Franklin.

I count him braver who overcomes his desires than him who conquers his enemies; for the hardest victory is over self. – Aristotle.

When the tyrant has disposed of foreign enemies by conquest or treaty, and there is nothing more to fear from them, then he is always stirring up some war or other, in order that the people may require a leader. - Plato.