The identity of intelligence and of intelligible entities may be demonstrated as follows. The object that intelligence contemplates must be in it, or exist outside of itself. It is, besides, evident, that intelligence contemplates; since, for intelligence, to think is to be intelligence,[337] therefore, to abstract its thought would be to deprive it of its "being." This being granted, we must determine in what manner intelligence contemplates its object. We shall accomplish this by examining the different faculties by which we acquire various kinds of knowledge, namely, sensation, imagination and intelligence. The principle which makes use of the senses contemplates only by grasping exterior things, and far from uniting itself to the objects of its contemplation, from this perception it gathers no more than an image. Therefore when the eye sees the visible object, it cannot identify itself with this object; for it would not see it, unless it were at a certain distance therefrom. Likewise if the object of touch confused itself with the organ that touches it, it would disappear. Therefore the senses, and the principle that makes use of the senses, apply themselves to what is outside of them to perceive this sense-object. Likewise imagination applies its attention to what is outside of it to form for itself an image of it; it is by this very attention to what is outside of it that it represents to itself the object of which it forms an image as exterior. That is how sensation and imagination perceive their objects. Neither of these two faculties folds itself back on itself, nor concentrates on itself, whether the object of their perception be a corporeal or incorporeal form.