For a far greater plague is the corruption of the mind, than any certain change and distemper of the common air can be. This is a plague of creatures, as they are living creatures; but that of men as they are men or reasonable.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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Author Marcus Aurelius
Source Meditations
Topic corruption change
Date c. 170 - 180
Language English
Reference
Note Translated by Meric Casaubon
Weblink https://en.wikisource.org/wiki/Marcus_Aurelius_Antoninus_-_His_Meditatio...

Context

“But if this cannot be, yet it is some comfort for a man joyfully to depart as weary, and out of love with those; rather than to desire to live, and to continue long in those wicked courses. Hath not yet experience taught thee to fly from the plague? For a far greater plague is the corruption of the mind, than any certain change and distemper of the common air can be. This is a plague of creatures, as they are living creatures; but that of men as they are men or reasonable. III. Thou must not in matter of death carry thyself scornfully, but as one that is well pleased with it, as being one of those things that nature hath appointed. For what thou dost conceive of these, of a boy to become a young man, to wax old, to grow, to ripen, to get teeth, or a beard, or grey hairs to beget, to bear, or to be delivered; or what other action soever it be, that is natural unto man according to the several seasons of his life; such a thing is it also to he dissolved.” source