Meditations 4.39

What is evil to thee does not subsist in the ruling principle of another; nor yet in any turning and mutation of thy corporeal covering. Where is it then? It is in that part of thee in which subsists the power of forming opinions about evils. Let this power then not form [such] opinions, and all is well. And if that which is nearest to it, the poor body, is cut, burnt, filled with matter and rottenness, nevertheless let the part which forms opinions about these things be quiet; that is, let it judge that nothing is either bad or good which can happen equally to the bad man and the good. For that which happens equally to him who lives contrary to nature and to him who lives according to nature, is neither according to nature nor contrary to nature.

Marcus Aurelius, Meditations 4.39, translated by George Long

Harm to thee cannot depend on another's ruling Reason, nor yet on any vagary or phase of thy environment. On what then? On the power that is thine of judging what is evil. Let this, then, pass no judgment, and all is well. Even if its closest associate, the poor body, be cut, be burnt, fester, gangrene, yet let the part which forms a judgment about these things hold its peace, that is, let it assume nothing to be either good or bad, which can befall a good man or a bad indifferently. For that which befalls alike the man who lives by the rule, and the man who lives contrary to the rule, of Nature, is neither in accordance with Nature nor contrary to it.

Marcus Aurelius, Meditations 4.39, translated by C. R. Haines