They say that you may not choose your family, but you may choose your friends.
Though is not untrue, it doesn't tell the whole story.
For sure, I may decide and choose to whom I shall grant the chance to be my friend. At the same time, I cannot grant myself the same to be someone's friend, for just as a man's soul is his alone to keep, so I may not move another's heart to open up and let me in. That choice is theirs and theirs alone to make.
Thus, I thank you, for I am honoured at your decision, at your choice, to call me friend.