Rabbi Naftali of Ropschitz said, "Before my neshama descended to earth, I saw an inscription on one of the walls of Gan Eden, 'You must be very, very humble,' (Ethics of our Fathers 4:4). However, on another wall there was the inscription, 'A person must say: The world was created just for my sake,' (Sanhedrin 37a). I tried to reconcile these conflicting statements. I had not yet solved the problem when I heard the exclamation, 'Mazal Tov! You have a son!' I have spent the rest of my life trying to resolve the conflict.
Rabbi Abraham J. Twerski in Angels Don't Leave Footprints.