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Christians, then, should expect to find nonbelievers who are much nicer, kinder, wiser, and better than they are. Why? Christian believers are not accepted by God because of their moral performance, wisdom, or virtue, but because of Christ's work on their behalf. Most religious and philosophies of life assume that one's spiritual status depends on your religious attainments. This naturally leads adherents to feel superior to those who don't believe and behave as they do. The Christian gospel, in any case, should not have that effect.

The Reason for God by Timothy Keller, p. 20