17. From what has now been said it is evident that charity, so far as it is the affection of good or of use, produces faith as the means by which it may manifest itself; consequently, that charity and faith act conjointly in performing uses; and also that faith does not produce good or use from itself, but from charity; for faith is charity as to its means of operation. It is therefore a fallacy to suppose that faith produces good as a tree does fruit. The tree is not faith, but man is the tree.