11. From science a man knows whether gold is good in substance, is alloyed and falsified, or is merely overlaid; but he does not know from science whether the good he does is good in itself. This only does he know: that good from God is good, and that good from man is not good. Therefore, as it concerns his salvation for him to know whether the good he does is from God, or is not from God, this must be revealed. But before this is done something shall be said about goods.