11. Man knows from science whether gold is good in substance, whether it is alloyed and counterfeit, and whether it is overlaid; but he does not know from science whether the good he does is good in itself. This only he knows, that good from God is good, and that good from man is not good. Therefore, because it is of importance to his salvation to know whether the good he does is from God, or whether it is not from God, this must be revealed. But before it is revealed, something will be said concerning the kinds of good.