A true friend is the greatest of all blessings, and that which we take the least care of all to acquire.

True friendship can afford true knowledge. It does not depend on darkness and ignorance.

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

Friendship is unnecessary, like philosophy, like art... It has no survival value rather it is one of those things that give value to survival.

Instead of loving your enemies - treat your friends a little better.

Peace and friendship with all mankind is our wisest policy, and I wish we may be permitted to pursue it.

Real friendship, like real poetry, is extremely rare - and precious as a pearl.

Friendship is the shadow of the evening, which increases with the setting sun of life.

Friendship may, and often does, grow into love, but love never subsides into friendship.

Never make friends with people who are above or below you in status. Such friendships will never give you any happiness.