Good deeds remain good, no matter whether we know how the world was made or not. Vile deeds are vile, no matter whether we know or do not know what, after death, will be the fate of the doer. We know, at least, what his fate is now, namely, to be wedded to the vileness.
The question for anyone to decide, who hesitates between good and evil, is whether he aspires to be a full-weight man, or merely the fragment, nay, the counterfeit of a man. Only he who ceaselessly aims at moral completeness is, in the true sense, a human being.