Contraries are absolutely opposed to each other, since the connotation of that word implies things as opposite to each other as possible. Measure, determination, and the other characteristics of the divine nature[178] are the opposites of incommensurability, indefiniteness, and the other contrary things that constitute the nature of evil. Each one of these wholes, therefore, is the contrary of the other. The being of the one is that which is essentially and absolutely false; that of the other is genuine Being; the falseness of the one is, therefore, the contrary of the truth of the other. Likewise what pertains to the being of the one is the contrary of what belongs to the being of the other. We also see that it is not always true to say that there is no contrary to "being," for we acknowledge that water and fire are contraries, even if they did not contain the common element of matter, of which heat and cold, humidity and dryness, are accidents. If they existed alone by themselves, if their being were complete without any common subject, there would still be an opposition, and an opposition of "being." Therefore the things that are completely separate, which have nothing in common, which are as distant as possible, are by nature contrary. This is not an opposition of quality, nor of any kinds of beings; it is an opposition resulting from extreme distance, and from being composed of contraries, thereby communicating this characteristic to their elements. GOOD IMPLIES EVIL BECAUSE MATTER IS NECESSARY TO THE WORLD. 7. Why is the existence of both good and evil necessary? Because matter is necessary to the existence of the world. The latter is necessarily composed of contraries, and, consequently, it could not exist without matter. In this case the nature of this world is a mixture of intelligence and necessity.[179] What it receives from divinity are goods; its evils derive from the primordial nature,[180] the term used (by Plato) to designate matter as a simple substance yet unadorned by a divinity. But what does he mean by "mortal nature?" When he says that "evils besiege this region here below," he means the universe, as appears from the following quotations[181]: "Since you are born, you are not immortal, but by my help you shall not perish." In this case it is right to say that evils cannot be annihilated. How then can one flee from them?[182] Not by changing one's locality, (as Plato) says, but by acquiring virtue, and by separating from the body, which, simultaneously, is separation from matter; for being attached to the body is also attachment to matter. It is in the same sense that (Plato) explains being separated from the body, or not being separated from it. By dwelling with the divinities he means being united to the intelligible objects; for it is in them that inheres immortality. EXISTENCE OF EVIL IS NECESSARY AS LAST MATERIAL DEGREE OF BEING.