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

Friendship is born at that moment when one person says to another: "What! You too? I thought I was the only one."-—C. S. Lewis 

Friendship is like money, easier made than kept.--Samuel Butler 

Friendship is the golden thread that ties the heart of all the world.--John Evelyn 

Friendship is the only cement that will ever hold the world together.--Woodrow Wilson 

Friendship is unnecessary, like philosophy, like art...it has no survival value; rather, it is one of those things that give value to survival.--C. S. Lewis 

Friendship of a kind that cannot easily be reversed tomorrow must have its roots in common interests and shared beliefs.--Barbara Tuchman 

Friendships multiply joys and divide grief.--Thomas Fuller