text: The topic about which you ask me is one of those where our only concern with knowledge is to have the knowledge. Nevertheless, because it does so far concern us, you are in a hurry; you are not willing to wait for the books which I am at this moment arranging for you, and which embrace the whole department of moral philosophy. I shall send you the books at once; but I shall, before doing that, write and tell you how this eagerness to learn, with which I see you are aflame, should be regulated, so that it may not get in its own way. Things are not to be gathered at random; nor should they be greedily attacked in the mass; one will arrive at a knowledge of the whole by studying the parts. The burden should be suited to your strength, nor should you tackle more than you can adequately handle. Absorb not all that you wish, but all that you can hold. Only be of a sound mind, and then you will be able to hold all that you wish. For the more the mind receives, the more does it expand.