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

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 not something you learn in school. But if you haven't learned the meaning of friendship, you really haven't learned anything.

That friendship will not continue to the end which is begun for an end.

Since there is nothing so well worth having as friends, never lose a chance to make them.

Don't walk behind me I may not lead. Don't walk in front of me I may not follow. Just walk beside me and be my friend.

Friendship is a strong and habitual inclination in two persons to promote the good and happiness of one another.

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

Caring for but never trying to own may be a further way to define friendship.

Wishing to be friends is quick work, but friendship is a slow ripening fruit.