But, dear Karl, do not fall into the opposite extreme. Neglect, especially as one is not always inclined to seek the most honourable reason for it, is not easily forgiven by distinguished persons, or those who think themselves such, and particularly if they have shown a certain degree of condescension. At your age and in your position you cannot demand any reciprocity. Nor must the body be neglected.
Good health is the greatest boon for everyone, for scholars most of all.
Do not overdo things. With your natural gifts and your present diligence, you will reach your goal, and a single term does not matter. However much experience I may have, I cannot draw up a complete plan for you with a clear survey of all nuances. In any case, it seems to me beyond doubt that your intention of advancing yourself by academic studies is quite good and suitable for you, if, besides, you do not overlook the trifle of paying some attention to physical development. But, of course, this may take rather a long time and given the state of things it would of course be desirable that something be done about it.