The upholder of Happening must be asked how this false happening can be supposed to have come about, taking it that it did, and how the happening, then, is not universally prevalent. If there is to be a natural scheme at all, it must be admitted that this happening does not and cannot exist: for if we attribute to chance the Principle which is to eliminate chance from all the rest, how can there ever be anything independent of chance? And this Nature does take away the chanced from the rest, bringing in form and limit and shape. In the case of things thus conformed to reason the cause cannot be identified with chance but must lie in that very reason; chance must be kept for what occurs apart from choice and sequence and is purely concurrent. When we come to the source of all reason, order and limit, how can we attribute the reality there to chance? Chance is no doubt master of many things but is not master of Intellectual-Principle, of reason, of order, so as to bring them into being. How could chance, recognised as the very opposite of reason, be its Author? And if it does not produce Intellectual-Principle, then certainly not that which precedes and surpasses that Principle. Chance, besides, has no means of producing, has no being at all, and, assuredly, none in the Eternal. Enneads: VI VIII. 10