Robert M. Price said this quote

It means that your birth, with all your particulars, is a wildly improbable event, and hence precious. You won the sweepstakes by being born at all. Think of all the wallflower sperm and egg cells. You made it, buddy. Whew! What a staggering wonder! What a thing to rejoice in! The lottery wasn't fixed! God didn't rig it! You won fair and square! What a miracle!