If, then, of such a pair of corresponding series there is always one series of the desirable, and the known and the perceived are in general constituted by their participation in the nature of the determined; so that to wish to perceive one's self is to wish oneself to be of a certain definite character, since, then, we are not in ourselves possessed of each of such characters, but only by participation in these qualities in perceiving and knowing for the perceiver becomes perceived in that way and in that respect in which he first perceives, and according to the way in which and the object which he perceives; and the knower becomes known in the same way