The doctrine of the sacraments follows the Christology; the sacraments "have efficacy from the incarnate Word himself". They are not only signs of sanctification, but also bring it about. It is inevitable that they bring spiritual gifts in sensuous form, because of the sensuous nature of man. The "res sensibiles" are the matter, the words of institution the form of the sacraments. Contrary to the Franciscan view that the sacraments are mere symbols whose efficacy God accompanies with a directly following creative act in the soul, St. Thomas holds it not unfit to agree with Hugo of St. Victor that "a sacrament contains grace", or to teach that they "cause grace".