No birth certificate is issued when 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 with out 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.
Once in a while you meet someone, and soon you both discover the two of you are truly something special to each other... you share your thoughts and feelings so relaxed, so openly, and right away you know your friendship's truly meant to be.
One of the surest evidences of friendship that one individual can display to another is telling him gently of a fault. If any other can excel it, it is listening to such a disclosure with gratitude, and amending the error.