Again, the power of comprehension is a peculiar property of the mind; and the reasoning power is perhaps common to the more divine natures, but is especially the property of the mortal nature of man: and this is a twofold power, one kind being that in accordance with which we are rational creatures, partaking of mind; and the other kind being that faculty by which we converse. (24) There is also another power in the soul akin to these, the power of sensation, of which we are now speaking; for Moses is describing nothing else on this occasion except the formation of the external sense, according to energy and according to reason.

VIII. For immediately after the creation of the mind it was necessary that the external sense should be created, as an assistant and ally of the mind; therefore God having entirely perfected the first, proceeded to make the second, both in rank and power, being a certain created form, an external sense according to energy, created for the perfection and completion of the whole soul, and for the proper comprehension of such subject matter as might be brought before it. (25) How then was this second thing created? As Moses himself says in a subsequent passage, when the mind was gone to sleep: for, in real fact, the external sense then comes forward when the mind is asleep. And again, when the mind is awake the outward sense is extinguished; and the proof of this is, that when we desire to form an accurate conception of anything, we retreat to a desert place, we shut our eyes, we stop up our ears, we discard the exercise of our senses; and so, when the mind rises up again and awakens, the outward sense is put an end to. (26) Let us now consider another point, namely, how the mind goes to sleep: for when the outward sense is awakened and has become excited, when the sight beholds any works of painting or of sculpture beautifully wrought, is not the mind then without anything on which to exercise its functions, contemplating nothing which is a proper subject for the intellect? What more? When the faculty of hearing is attending to some melodious combination of sound, can the mind turn itself to the contemplation of its proper objects? by no means. And it is much more destitute of occupation, when taste rises up and eagerly devotes itself to the pleasures of the belly; (27) on which account Moses, being alarmed lest some day or other the mind might not merely go to sleep, but might become absolutely dead, says in another place, “And it shall be to you a peg in your girdle; and it shall be, that when you sit down you shall dig in it, and, heaping up earth, shall cover your Shame.”{2}{#de 23:13.} Speaking symbolically, and giving the name of peg to reason which digs up secret affairs; (28) and he bids him to bear it upon the affection with which he ought to be birded, and not to allow it to slacken and become loosened; and this must be done when the mind, departing from the intense consideration of objects perceptible by the intellect, is brought down to the passions, and sits down, yielding to, and being guided by, the necessities of the body: (29) and this is the case when the mind, being absorbed in luxurious associations, forgets itself, being subdued by the things which conduct it to pleasure, and so we become enslaved, and yield ourselves up to unconcealed impurity. But if reason be able to purify the passion, then neither when we drink do we become intoxicated, nor when we eat do we become indolent through satiety, but we feast soberly without indulging in folly. (30) Therefore, the awakening of the outward senses is the sleep of the mind; and the awakening of the mind is the discharge of the outward senses from all occupation. Just as when the sun arises the brightness of all the rest of the stars becomes invisible; but when the sun sets, they are seen. And so, like the sun, the mind, when it is awakened, overshadows the outward senses, but when it goes to sleep it permits them to shine.