Depth of friendship does not depend on length of acquaintance.

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

There is some self-interest behind every friendship. There is no friendship without self-interests. This is a bitter truth.

There are no rules for friendship. It must be left to itself. We cannot force it any more than love.

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

You can always tell a real friend: when you've made a fool of yourself he doesn't feel you've done a permanent job.

Lots of people want to ride with you in the limo, but what you want is someone who will take the bus with you when the limo breaks down.

Peace, commerce and honest friendship with all nations entangling alliances with none.

As iron sharpens iron, so a friend sharpens a friend.

Never explain - your friends do not need it and your enemies will not believe you anyway.