Author: Timothy J. KellerWhat are the marks of a supernaturally changed heart? This is one of the questions the Apostle Paul addresses as he writes to the church in Corinth. He's not after some superficial outward tinkering, but instead a deep rooted, life altering change that takes place on the inside. In an age where pleasing people, puffing up your ego and building your résumé are seen as the methods to 'make it', the Apostle Paul calls us…