Value friendship for what there is in it, 
not for what can be gotten out of it.
H. Clay Trumbull

One friend in a lifetime is much; two are many; three are hardly possible.
Henry Adams

Friendship is the soul's heaven.
A. Bronson Alcott

A friend is, as it were, a second self.
Cicero

Be gracious to all men, but choose the best to be your friends.
Isocrates

Friendship needs no words--it is solitude delivered from the anguish of loneliness.
Dag Hammarskjold