A friend is someone who knows the song in your heart and can sing it back to you once you've forgotten the words.
Friends buy you food. Best friends eat your food.
Friends and good manners will carry you where money won't go.
Friendship is unnecessary, like philosphy, like art... It has no survival value; rather is one of those things that give value to survival.
True friendship is sitting together in silence and feeling like it was the best conversation you've ever had.