Friendship is born at that moment when one person says to another, 'What! You too? I thought I was the only one.'
Friendship is unnecessary, like philosophy, like art... It has no survival value; rather it is one of those things that give value to survival.
Friendship is the source of the greatest pleasures, and without friends even the most agreeable pursuits become tedious.
Friendship marks a life even more deeply than love. Love risks degenerating into obsession, friendship is never anything but sharing.
Friendship improves happiness and abates misery, by the doubling of our joy and the dividing of our grief.