Sin is the antithesis of virtue. That moral principle is the reason which makes us desire the reward of righteousness is one and the same with that which makes us crave the due punishment of wickedness; moral approval of virtue and moral indignation against evil are not effluences of two principles in the reason, but of one only. They are differentiated solely by the opposition of the two contrasted objects. The sincere approbation of the good necessitates moral indignation against the evil, because the objects of the two sentiments are opposites. Everybody thinks thus. Nobody would believe that man to be capable of sincere moral admiration for good actions who should declare himself incapable of moral resentment towards vile conduct.
Christ Our Penal Substitute, pp. 48-49