 In this way Auriol attempts to deal with the problems he saw in other theories of concepts. On the one hand, he attempts to get our knowledge grounded as firmly as possible on extra-mental things: a concept simply is the intellected extra-mental particular in a different type of being from that which it has extra-mentally, a type of being that is nevertheless intrinsic to the extra-mental particular; the concept offers no barrier whatsoever between conceiving mind and conceived object. At the same time, however, Auriol wants to preserve the universality of universal concepts and their use in essential predications and necessary, scientific knowledge, and he thinks that his theory of concepts does just that. Because rationes of the same kind found in different individuals are “maximally similar,” they all direct the mind to form the same concept. Thus the concept ‘human being’ arising from Socrates is the same as the concept ‘human being’ arising from Plato, since they are both based on the maximally similar ratio of rationality. Auriol is clear that a universal concept is all of its particulars, rose is all particular roses, animal is all particular animals. That is to say, animal is the concept and every really existing animal at the same time.