Of the third evil which comes to the soul by way of the distinct natural knowledge or the memory.

THE third evil which comes to the soul through the natural apprehensions of the memory is privative; for these apprehensions can hinder moral good and deprive us of spiritual good. And, in order that we may first of all explain how these apprehensions hinder moral good in the soul, it must be known that moral good consists in the restraining of the passions and the curbing of disorderly desires, from which restraint there come to the soul tranquillity, peace and rest, and moral virtues, all of which things are moral good. This restraining and curbing of the passions cannot be truly accomplished by the soul that forgets not and withdraws not itself from things pertaining to itself, whence arise the affections; and no disturbances ever arise in the soul save through the apprehensions of the memory. For, when all things are forgotten, there is naught that can disturb peace or that moves the desires; since, as they say, that which the eye sees not the heart desires not.

2. This we are constantly learning by experience; for we observe that, whenever the soul begins to think of any matter, it is moved and disturbed, either much or little, with respect to that thing, according to the nature of its apprehension. If it be a troublesome and grievous matter, the soul finds sadness in it; if pleasant, desire and joy, and so forth. Wherefore the result of the changing of that apprehension is necessarily disturbance; and thus the soul is now joyful, now sad; now it hates, now loves; and it cannot continue in one and the same attitude (which is an effect of moral tranquillity save when it strives to forget all things. It is clear, then, that knowledge greatly hinders the good of the moral virtues in the soul.

3. Again, what has been said clearly proves that an encumbered memory also hinders spiritual good; for the soul that is disturbed, and has no foundation of moral good, is to that extent incapable of spiritual good, which impresses itself only upon souls that are restrained and at peace. And besides this, if the soul pays attention and heed to the apprehensions of the memory -- seeing that it can attend to but one thing at a time -- and busies itself with things that can be apprehended, such as the knowledge of the memory, it is not possible for it to be free to attend to the incomprehensible, which is God. For, in order to approach God, the soul must proceed by not comprehending rather than by comprehending; it must exchange the mutable and comprehensible for the immutable and incomprehensible.