Unless we believe the gospel, we will be driven in all we do-whether obeying or disobeying-by pride ('self-love') or fear ('of damnation'). Apart from 'grateful remembering' of the gospel, all good works are done then for sinful motives. Mere moral effort may restrain the heart, but does not truly change the heart. Moral effort merely 'jury rigs' the evil of the heart to produce moral behavior out of self-interest. It is only a matter of time before such a thin tissue collapses.
Timothy KellerImportant reminder: It's not fair of you to demand more proof of Christians for their beliefs than you demand for your own.
Timothy KellerGod’s grace does not come to people who morally outperform others, but to those who admit their failure to perform and who acknowledge their need for a Savior.
Timothy KellerThere's nothing that makes you more miserable (or less interesting) than self-absorption .
Timothy Keller