Tim Keller on Christmas

I ran across this quote from Tim Keller in Come, Thou Long Expected Jesus, a compilation of Christmas writings by various authors. 

Christmas is the end of thinking you are better than someone else, because Christmas is telling you that you could never get to heaven on your own. God had to come to you. It is telling you that people who are saved are not those who have arisen through their own ability to be what God wants them to be. Salvation comes to those who admit how weak they are.