“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.”
― Albert Camus

“If you live to be a hundred, I want to live to be a hundred minus one day so I never have to live without you.”
― A.A. Milne, Winnie-the-Pooh  

“A friend is one that knows you as you are, understands where you have been, accepts what you have become, and still, gently allows you to grow.”
― William Shakespeare 

“I would rather walk with a friend in the dark, than alone in the light.”
― Helen Keller

“Friendship is unnecessary, like philosophy, like art.... It has no survival value; rather it is one of those things which give value to survival.”
― C.S. Lewis, The Four Loves

“Only a true best friend can protect you from your immortal enemies.”
― Richelle Mead, Vampire Academy

“Friendship is the hardest thing in the world to explain. It's not something you learn in school. But if you haven't learned the meaning of friendship, you really haven't learned anything.”
― Muhammad Ali