Marcus Aurelius
Meditations 9.41
Epicurus says, In my sickness my conversation was not about my bodily sufferings, nor, says he, did I talk on such subjects to those who visited me; but I continued to discourse on the nature of things as before, keeping to this main point, how the mind, while participating in such movements as go on in the poor flesh, shall be free from perturbations and maintain its proper good. Nor did I, he says, give the physicians an opportunity of putting on solemn looks, as if they were doing something great, but my life went on well and happily. Do, then, the same that he did both in sickness, if thou art sick, and in any other circumstances; for never to desert philosophy in any events that may befall us, nor to hold trifling talks either with an ignorant man or with one unacquainted with nature, is a principle of all schools of philosophy; but to be intent only on that which thou art now doing and on the instrument by which thou doest it.
Marcus Aurelius, Meditations 9.41, translated by George Long
Listen to Epicurus where he says: In my illness my talk was not of any bodily feelings, nor did I chatter about such things to those who came to see me, but I went on with my cardinal disquisitions on natural philosophy, dwelling especially on this point, hom the mind, having perforce its share in such affections of the flesh, yet remains unperturbed, safeguarding its own proper good. Nor did I—he goes on—let the physicians ride the high horse as if they were doing grand things, but my life went on well and happily. Imitate him then in sickness, if thou art sick, and in any other emergency; for it is a commonplace of every sect not to renounce Philosophy whatever difficulties we encounter, nor to consent to babble as he does that is unenlightened in philosophy and nature; . . . devote thyself to thy present work alone and thy instrument for performing it.
Marcus Aurelius, Meditations 9.41, translated by C. R. Haines