From this intelligible world, replete with omniform ideas, this sensible world, according to Plato, perpetually flows, depending on its artificer intellect, in the same manner as shadow on its forming substance. For as a deity of an intellectual characteristic is its fabricator, and both the essence and energy of intellect are established in eternity the sensible universe, which is the effect or production of such an energy, must be consubsistent with its cause, or in other words, must be a perpetual emanation from it. This will be evident from considering that every thing which is generated, is either generated by art or by nature, or according to power. It is necessary, therefore, that every thing operating according to nature or art should be prior to the things produced; but that things operating according to power should have their productions coexistent with themselves; just as the sun produces light coexistent with itself; fire, heat; and snow, coldness. If therefore the artificer of the universe produced it by art, he would not cause it simply to be, but to be in some particular manner; for all art produces form. Whence therefore does the world derive its being? If he produced it from nature, since that which makes by nature imparts something of itself to its productions, and the maker of the world is incorporeal, it would be necessary that the world, the offspring of such an energy, should be incorporeal. It remains therefore, that the demiurgus produced the universe by power alone; but every thing generated by power subsists together with the cause containing this power: and hence production of this kind cannot be destroyed unless the producing cause is deprived of power. The divine intellect therefore that produced the sensible universe caused it to be coexistent with himself.