Enneads I.1: The Organism and the Self
External and Internal Sensation
As to the faculty of sensation which is peculiar to the soul, it cannot be the power of perceiving the sense-objects themselves, but only their typical forms, impressed on the animal by sensation. These have already somewhat of the intelligible nature; the exterior sensation peculiar to the animal is only the image of the sensation peculiar to the soul; which, by its very essence is truer and more real, since it consists only in contemplating images while remaining impassible. Ratiocination, opinion and thought, which principally constitute us, deal exclusively with these images, by which the soul has the power of directing the organism.
No doubt these faculties are “ours,” but “we” are the superior principle which, from above, directs the organising but in this whole we shall have to distinguish an inferior part, mingled with the body, and a superior part, which is the true man. The former (irrational soul) constitutes the beast, as for instance, the lion; the latter is the rational soul, which constitutes man. In every ratiocination, it is “we” who reason, because ratiocination is the peculiar activity (or, energy) of the soul.