A man's soul doth wrong and disrespect itself first and especially, when as much as in itself lies it becomes an aposteme, and as it were an excrescency of the world, for to be grieved and displeased with anything that happens in the world, is direct apostacy from the nature of the universe; part of which, all particular natures of the world, are.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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

Context

“Remember that all is but opinion and conceit, for those things are plain and apparent, which were spoken unto Monimus the Cynic; and as plain and apparent is the use that may be made of those things, if that which is true and serious in them, be received as well as that which is sweet and pleasing. XIV. A man's soul doth wrong and disrespect itself first and especially, when as much as in itself lies it becomes an aposteme, and as it were an excrescency of the world, for to be grieved and displeased with anything that happens in the world, is direct apostacy from the nature of the universe; part of which, all particular natures of the world, are. Secondly, when she either is averse from any man, or led by contrary desires or affections, tending to his hurt and prejudice; such as are the souls of them that are angry. Thirdly, when she is overcome by any pleasure or pain.” source