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From whence then does the soul enjoy this motion whereby it comprehends what is subject to sense, different from that other intelligible motion which ends in knowledge? This is a difficult task to resolve, unless we steadfastly assert that Plato here did not compose the soul, so singly considered, but the soul of the world also, of the parts above mentioned,—of the more worthy indivisible substance, and of the less worthy divisible in reference to bodies. And this soul of the world is no other than that motion which gives heat and vigor to thought and fancy, and sympathizes with what is subject to sense, not created, but existing from eternity, like the other soul. For Nature, which had the power of understanding, had also the power of opining. But the intelligible power is subject neither to motion nor affection, being established upon a substance that is still the same. The other is movable and fleeting, as being engaged to an unstable, fluctuating, and disunited matter. In regard the sensible substance was so far from any order, that it was without shape and boundless. So that the power which is fixed in this was capable of producing no clear and well-grounded notions and no certain or well-ordered movements, but only sleepy dreams and deliriums, which amuse and trouble corporeal stupidity; unless by accident they lighted upon the more worthy substance. For it was in the middle between the sensible and discerning faculty, and had a nature conformable and agreeable to both; from the sensible apprehending substance, and borrowing from judgment its power of discerning things intelligible.
