Is there not in every human soul a primitive spark, a divine element, incorruptible in this world and immortal in the next, which can be developed by goodness, kindled, lit up, and made to radiate, and which evil can never entirely extinguish.
In [the soul] one part naturally rules, and the other is subject, and the virtue of the ruler we maintain to be different from that of the subject; the one being the virtue of the rational, and the other of the irrational part. Now, it is obvious that the same principle applies generally, and therefore almost all things rule and are ruled according to nature.