In order to receive pleasure from creatures, it is not enough to be surrounded with them, or even to possess them: we must, moreover, be endowed with organs, or faculties, through which we can receive and appropriate to ourselves the pleasures which, according to their nature, they can give. Thus, a grand concert, which pours the most exquisite pleasures into your soul, gives none at all to a deaf man, because he lacks the receiving organ, and hence the pleasure-giving object is, in his regard, as if it had no existence.