"Sam, there is a wonderful Jewish teaching that tells us that before a child is born, God infuses that child with all of the knowledge and wisdom he or she needs in life. Then God puts his finger to the child's lips and says, 'shh,' making at that moment a secret pact between the child and God. As the story goes, that's why everyone has that indentation on the upper lip. It's God's fingerprint."
(from Letters to Sam by Daniel Gottlieb)