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 KellerIf the evolutionary mechanism of natural selection depends on death, destruction, and violence of the strong against the weak, then these things are perfectly natural. On what basis, then, does the atheist judge the natural world to be horribly wrong, unfair, and unjust?
Timothy KellerHow could you possibly know that no religion can see the whole truth unless you yourself have the superior, comprehensive knowledge of spiritual reality you just claimed non of the religions have?
Timothy Keller