I never considered a difference of opinion in politics, in religion, in philosophy, as cause for withdrawing from a friend.

The snake that cannot shed its skin perishes. As well the minds which are prevented from changing their opinions; they cease to be mind.

The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.

Go up close to your friend, but do not go over to him! We should also respect the enemy in our friend.

Oh my only friend, my best beloved, the gates are open in my house-do not pass by like a dream.

An insincere and evil friend is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind.