Meditations 7.64

In every pain let this thought be present, that there is no dishonor in it, nor does it make the governing intelligence worse, for it does not damage the intelligence either so far as the intelligence is rational or so far as it is social. Indeed in the case of most pains let this remark of Epicurus aid thee, that pain is neither intolerable nor everlasting, if thou bearest in mind that it has its limits, and if thou addest nothing to it in imagination: and remember this too, that we do not perceive that many things which are disagreeable to us are the same as pain, such as excessive drowsiness, and the being scorched by heat, and the having no appetite. When then thou art discontented about any of these things, say to thyself that thou art yielding to pain.

Marcus Aurelius, Meditations 7.64, translated by George Long

Whenever thou art in pain, have this reflection ready, that this is nothing to be ashamed of, nor can it make worse the mind that holds the helm. For it cannot impair it in so far as it is rational or in so far as it is social. In most pains, however, call to thy rescue even Epicurus when he says that a pain is never unbearable or interminable, so that thou remember its limitations and add nothing to it in imagination. Recollect this too that many of our every-day discomforts are really pain in disguise, such as drowsiness, a high temperature, want of appetite. When inclined to be vexed at any of these, say to thyself: I am giving in to pain.

Marcus Aurelius, Meditations 7.64, translated by C. R. Haines