be troubled with seamen, carriers, and innkeepers, that laugh at you not because you play at ball or fight a shadow, but because in your discourse you exercise yourself by teaching others, or by enquiring and learning something yourself, or else by calling to mind something. For Socrates said, he that uses the exercise of dancing had need have a room big enough to hold seven beds; but he that makes either singing or discourse his exercise may do it either standing or lying in any place. But this one thing we must observe, that when we are conscious to ourselves that we are too full, or have been concerned with Venus, or labored hard, we do not too much strain our voice, as so many rhetoricians and readers in philosophy do, some of whom out of glory and ambition, some for reward or private contentions, have forced themselves beyond what has been convenient. Our Niger, when he was teaching philosophy in Galatia, by chance swallowed the bone of a fish; but a stranger coming to teach in his place, Niger, fearing he might run away with his repute, continued to read his lectures, though the bone still stuck in his throat; from whence a great and hard inflammation arising, he, being unable to undergo the pain, permitted a deep incision to be made, by which wound the bone was taken out; but the wound growing worse, and rheum falling upon it, it killed him. But this may be mentioned hereafter in its proper place. 17. After exercise to use a cold bath is boyish, and has more ostentation in it than health; for though it may seem to harden our bodies and make them not so subject to outward accidents, yet it does more prejudice to the inward parts, by hindering transpiration, fixing the humors, and condensing those vapors which love freedom and transpiration. Besides, necessity will force those who use cold baths into that exact and accurate way of diet they would so much avoid, and make them take care they be not in the least extravagant, for every such error is sure to receive a bitter reproof. But a warm bath is much more pardonable, for it does not so much destroy our natural vigor and strength as it does conduce to our health, laying a soft and easy foundation for concoction, preparing those things for digestion which are not easily digested without any pain (if they be not very crude and deep lodged), and freeing us from all inward weariness. But when we do sensibly perceive our bodies to be indifferent well, or as they ought to be, we should omit bathing, and anoint ourselves by the fire; which is better if the body stand in need of heat, for it dispenses a warmth throughout. But we should make use of the sun more or less, as the temper of the air permits. So much may suffice to have been said concerning exercises.