 We should say that the whole soul is the form of the body, in much the same way that we say that a person talks, not a tongue (ibid., p. 144). But if we direct our attention to the various parts of the soul, then it is wrong to say that the rational part, “per se and considered as such,” is the form of the body. The soul is the form of the body only with respect to its sensory and nutritive part. Given Olivi’s argumentation against the formal union between the intellectual part of the soul and the body, it may seem that the unity of the human being is compromised. Olivi argues, however, that the relation between these two parts is substantial even though it is mediated by the sensory part and the spiritual matter of the soul. He writes: