17. Putting aside, then, for a little while all other things, of which the mind is certain concerning itself, let us especially consider and discuss these three—memory, understanding, will. For we may commonly discern in these three the character of the abilities of the young also; since the more tenaciously and easily a boy remembers, and the more acutely he understands, and the more ardently he studies, the more praiseworthy is he in point of ability. But when the question is about any one’s learning, then we ask not how solidly and easily he remembers, or how shrewdly he understands; but what it is that he remembers, and what it is that he understands. And because the mind is regarded as praiseworthy, not only as being learned, but also as being good, one gives heed not only to what he remembers and what he understands, but also to what he wills (velit); not how ardently he wills, but first what it is he wills, and then how greatly he wills it. For the mind that loves eagerly is then to be praised, when it loves that which ought to be loved eagerly. Since, then, we speak of these three—ability, knowledge, use—the first of these is to be considered under the three heads, of what a man can do in memory, and understanding, and will. The second of them is to be considered in regard to that which any one has in his memory and in his understanding, which he has attained by a studious will. But the third, viz. use, lies in the will, which handles those things that are contained in the memory and understanding, whether it refer them to anything further, or rest satisfied with them as an end. For to use, is to take up something into the power of the will; and to enjoy, is to use with joy, not any longer of hope, but of the actual thing. Accordingly, every one who enjoys, uses; for he takes up something into the power of the will, wherein he also is satisfied as with an end. But not every one who uses, enjoys, if he has sought after that, which he takes up into the power of the will, not on account of the thing itself, but on account of something else.