 The discerning, inferring and elaborating of moral principles is a task for practical reasonableness. The judgments one makes in doing this are together called one’s conscience, in a sense prior to the sense in which conscience is the judgments one passes or could pass on one’s own acts considered retrospectively. Someone whose conscience is sound has in place the basic elements of sound judgment and practical reasonableness, that is of the intellectual and moral virtue which Aquinas calls prudentia. Full prudentia requires that one put one’s sound judgment into effect all the way down, i.e. into the particulars of choice and action in the face of temptations to unreasonable but perhaps not unintelligent alternatives.