"Keep your enemies in front of you"

"He has no enemies, but is intensely disliked by his friends"

"Am I not destroying my enemies when I make friends of them?"

"A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it"

"The man of knowledge must be able not only to love his enemies but also to hate his friends"

"A man who was completely innocent, offered himself as a sacrifice for the good of others, including his enemies, and became the ransom of the world. It was a perfect act"

"I no doubt deserved my enemies, but I don't believe I deserved my friends"

"Learning carries within itself certain dangers because out of necessity one has to learn from one's enemies"

"Give us grace and strength to forbear and to persevere. Give us courage and gaiety and the quiet mind, spare to us our friends, soften to us our enemies"

"The enemies of freedom do not argue; they shout and they shoot"

"Enemies are so stimulating"