  The view Suárez proposes holds that categories are distinguished according to “our way of conceiving, founded in reality. Some call this kind of distinction a distinction of reasoned reason, whereas others call it formal distinction” (DM 39, 2, 22; 1861, 25:516b). The distinction of reasoned reason is, according to Suárez, a conceptual distinction. Conceptual distinctions come in two varieties: One is the distinction of reasoned reason and the other the distinction of reasoning reason. The second has no basis in reality but is purely a creation of the mind; it arises out of the intellect's activity of comparing, which makes possible its infinite multiplication (DM 39, 2, 23; 1861, 25:517a). An example is the distinction between Peter and himself in order to say that he is identical to himself. The first, however, the distinction of reasoned reason, has a foundation in reality, even if the distinction itself is merely conceptual. This is the kind of distinction that we make when we think about God's attributes, for example. The foundation of this distinction in the case of categories must be sufficient to allow relations or modes of denomination of primary substance that are irreducible to one generic concept (DM 39, 2, 23; 1861, 25:517a).