I have a friend, jola, who writes the most educative and entertaining things. Her e-signature is the quote below. Go see jola's blog sometime.
No birth certificate is issued when a friendship is born. There is nothing tangible. There is just a feeling that your life is different and that your capacity to love and care has miraculously been enlarged without any effort on your part. It's like having a tiny apartment and somebody moves in with you, but instead of becoming cramped and crowded, the space expands, and you discover rooms you never knew you had until your friend moved in with you - STEVE TESICH