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

There is nothing on this earth more to be prized than true friendship.

I value the friend who for me finds time on his calendar, but I cherish the friend who for me does not consult his calendar.

Let there be no purpose in friendship save the deepening of the spirit.

The friend is the man who knows all about you, and still likes you.

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

It is important to our friends to believe that we are unreservedly frank with them, and important to friendship that we are not.

Friendship at first sight, like love at first sight, is said to be the only truth.

The language of friendship is not words but meanings.

Friendship is a plant of slow growth and must undergo and withstand the shocks of adversity before it is entitled to the appellation.