endeavours to prove or to disprove the eternity of the Universe by these arguments of the Mutakallemim, must necessarily rely on one of the two following propositions, or on both of them; namely on the tenth proposition, according to which the actual form of a thing is merely one of many equally possible forms, and which implies that there must be a being capable of making the special selection; or on the eleventh proposition which rejects the existence of an infinite series of things coming successively into existence. The last-named proposition is demonstrated in various ways, e.g., they advert to a class of transient individuals, and to a certain particular date. From the theory which asserts the eternity of the Universe, it would follow that the individuals of that class up to that particular date are infinite in number; a thousand years later the individuals of that class are likewise infinite in number; the last number must exceed the previous one by the number of the individuals born in those thousand years, and consequently one infinite number would be larger than another. The same argument is applied to the revolutions of the heavenly sphere, and in like manner it is shown that one infinite number of revolutions would be larger than another; the same result is obtained when revolutions of one sphere are compared with those of another moving more slowly; the revolutions of both spheres [though unequal] would be infinite in number. Similarly they proceed with all those accidents which are subject to destruction and production; the individual accidents that have passed into non-existence are counted and represented as though they were still in existence, and as though they were things with a definite beginning; this imaginary number is then either increased or reduced. Yet all these things have no reality and are mere fictions. Abunazar Alfarabi in criticizing this proposition, has exposed all its weak points, as you will clearly perceive, when you study his book on the changeable beings earnestly and dispassionately. These are the principal arguments of the Mutakallemim in seeking to establish the creatio ex nihilo. Having thus proved that the Universe is not eternal, they necessarily infer that there is an Agens who created it in accordance with His intention, desire and will. They then proceed to prove the unity of that Agens as I am going to point out in the next chapter. CHAPTER LXXV In this chapter I shall explain to you how the Mutakallemim prove the Unity of God. They contend that the Maker and Creator of the Universe, the existence of whom is testified by all nature, is One. Two propositions are employed by them in demonstrating the Unity of God, viz., two deities or more would neutralize each other, and if several deities existed they would be distinguished from each other by a specific difference. First Argument.