Men suffer also from one another, and perhaps the largest part of human suffering comes to man from those whom he calls his brothers.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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Author Marcus Aurelius
Source Meditations
Topic suffering
Date c. 170 - 180
Language English
Reference
Note Translated by George Long
Weblink https://www.gutenberg.org/files/15877/15877-h/15877-h.htm

Context

“All living things undergo the change which we call death. If we call death an evil, then all change is an evil. Living beings also suffer pain, and man suffers most of all, for he suffers both in and by his body and by his intelligent part. Men suffer also from one another, and perhaps the largest part of human suffering comes to man from those whom he calls his brothers. Antoninus says (viii. 55) , "Generally, wickedness does no harm at all to the universe; and particularly, the wickedness [of one man] does no harm to another. It is only harmful to him who has it in his power to be released from it as soon as he shall choose."” source