12. If the existence of Matter be denied, the necessity of this Principle must be demonstrated from the treatises "On Matter" where the question is copiously treated.
To deny Evil a place among realities is necessarily to do away with the Good as well, and even to deny the existence of anything desirable; it is to deny desire, avoidance and all intellectual act; for desire has Good for its object, aversion looks to Evil; all intellectual act, all Wisdom, deals with Good and Bad, and is itself one of the things that are good.
There must then be The Good- good unmixed- and the Mingled Good and Bad, and the Rather Bad than Good, this last ending with the Utterly Bad we have been seeking, just as that in which Evil constitutes the lesser part tends, by that lessening, towards the Good.
What, then, must Evil be to the Soul?
What Soul could contain Evil unless by contact with the lower Kind? There could be no desire, no sorrow, no rage, no fear: fear touches the compounded dreading its dissolution; pain and sorrow are the accompaniments of the dissolution; desires spring from something troubling the grouped being or are a provision against trouble threatened; all impression is the stroke of something unreasonable outside the Soul, accepted only because the Soul is not devoid of parts or phases; the Soul takes up false notions through having gone outside of its own truth by ceasing to be purely itself.
One desire or appetite there is which does not fall under this condemnation; it is the aspiration towards the Intellectual-Principle: this demands only that the Soul dwell alone enshrined within that place of its choice, never lapsing towards the lower.
Evil is not alone: by virtue of the nature of Good, the power of Good, it is not Evil only: it appears, necessarily, bound around with bonds of Beauty, like some captive bound in fetters of gold; and beneath these it is hidden so that, while it must exist, it may not be seen by the gods, and that men need not always have evil before their eyes, but that when it comes before them they may still be not destitute of Images of the Good and Beautiful for their Remembrance.