For even as the visual faculty, by means of light, is nourished and fed by objects which can be seen, and which, when the light is quenched, are not seen, even so, by means of the desire, the soul is nourished and fed by all things wherein it can take pleasure according to its faculties; and, when this also is quenched, or rather, mortified, the soul ceases to feed upon the pleasure of all things, and thus, with respect to its desire, it remains unoccupied and in darkness. So that the soul that has denied and thrust away from itself the pleasures which come from all these things, and has mortified its desire with respect to them, may be said to be, as it were, in the darkness of night, which is naught else than an emptiness within itself of all things. We call this detachment night to the soul, for we are not treating here of the lack of things, since this implies no detachment on the part of the soul if it has a desire for them; but we are treating of the detachment from them of the taste and desire, for it is this that leaves the soul free and void of them, although it may have them; for it is not the things of this world that either occupy the soul or cause it harm, since they enter it not, but rather the will and desire for them, for it is these that dwell within it.

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