Plutarch's Rules for the Preservation of Health (24-25)

ZEUXIPPUS. For health is not to be purchased by sloth and idleness, for those are chief inconveniences of sickness; and there is no difference between him who thinks to enjoy his health by idleness and quiet, and him who thinks to preserve his eyes by not using them, and his voice by not speaking. For such a man’s health will not be any advantage to him in the performance of many things he is obliged to do as a man. Idleness can never be said to conduce to health, for it destroys the very end of it. Nor is it true that they are the most healthful that do least. For Xenocrates was not more healthful than Phocion, or Theophrastus than Demetrius. It signified nothing to Epicurus or his followers, as to that so much talked of good habit of body, that they declined all business, though it were never so honorable. We ought to preserve the natural constitution of our bodies by other means, knowing every part of our life is capable of sickness and health.

ZEUXIPPUS. The contrary advice to that which Plato gave his scholars is to be given to those who are concerned in public business. For he was wont to say, whenever he left his school; Go to, my boys, see that you employ your leisure in some honest sport and pastime. Now to those that are in public office our advice is, that they bestow their labor on honest and necessary things, not tiring their bodies with small or inconsiderable things. For most men upon accident torment themselves with watchings, journeyings, and running up and down, for no advantage and with no good design, but only that they may do others an injury, or because they envy them or are competitors with them, or because they hunt after unprofitable and empty glory. To such as these I think Democritus chiefly spoke when he said, that if the body should summon the soul before a court on an action for ill-treatment, the soul would lose the case. And perhaps on the other hand Theophrastus spoke well, when he said metaphorically, that the soul pays a dear house-rent to its landlord the body. But still the body is very much more inconvenienced by the soul, when it is used beyond reason and there is not care enough taken of it. For when it is in passion, action, or any concern, it does not at all consider the body. Jason, being somewhat out of humor, said, that in little things we ought not to stand upon justice, so that in greater things we may be sure to do it. We, and that in reason, advise any public man to trifle and play with little things, and in such cases to indulge himself, so that in worthy and great concerns he may not bring a dull, tired, and weary body, but one that is the better for having lain still, like a ship in the dock, that when the soul has occasion again to call it into business, it may run with her, like a sucking colt with the mare.

ZEUXIPPUS. Upon which account, when business gives us leave, we ought to refresh our bodies, grudging them neither sleep nor dinner nor that ease which is the medium between pain and pleasure; not taking that course which most men do, who thereby wear out their bodies by the many changes they expose them to, making them like hot iron thrown into cold water, by softening and troubling them with pleasures, after they have been very much strained and oppressed with labor. And on the other side, after they have opened their bodies and made them tender either by wine or venery, they exercise them either at the bar or at court, or enter upon some other business which requires earnest and vigorous action. Heraclitus, when he was in a dropsy, desired his physician to bring a drought upon his body, for it had a glut of rain. Most men are very much in the wrong who, after being tired or having labored or fasted, moisten (as it were) and dissolve their bodies in pleasure, and again force and distend them after those pleasures. Nature does not require that we should make the body amends at that rate. But an intemperate and slavish mind, so soon as it is free from labor, like a sailor, runs insolently into pleasures and delights, and again falls upon business, so that nature can have no rest or leave to enjoy that temper and calmness which it does desire, but is troubled and tormented by all this irregularity. Those that have any discretion never so much as offer pleasure to the body when it is laboring, — for at such times they do not require it at all, — nor do they so much as think of it, their minds being intent upon that employ they are in, either the delight or diligence of the soul getting the mastery over all other desires. Epaminondas is reported wittily to have said of a good man that died about the time of the battle of Leuctra, How came he to have so much leisure as to die, when there was so much business stirring? It may truly be asked concerning a man that is either of public employ or a scholar, What time can such a man spare, either to debauch his stomach or be drunk or lascivious? For such men, after they have done their business, allow quiet and repose to their bodies, reckoning not only unprofitable pains but unnecessary pleasures to be enemies to nature, and avoiding them as such.