A man must not retire into solitude and cut himself off from his fellow-men. He must be ever active to do his part in the great whole. All men are his kin, not only in blood, but still more by participating in the same intelligence and by being a portion of the same divinity.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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Author Marcus Aurelius
Source Meditations
Topic intelligence solitude
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

“Man must also live conformably to the universal nature, conformably to the nature of all things of which he is one; and as a citizen of a political community he must direct his life and actions with reference to those among whom, among other purposes, he lives. [A] A man must not retire into solitude and cut himself off from his fellow-men. He must be ever active to do his part in the great whole. All men are his kin, not only in blood, but still more by participating in the same intelligence and by being a portion of the same divinity. A man cannot really be injured by his brethren, for no act of theirs can make him bad, and he must not be angry with them nor hate them: "For we are made for co-operation, like feet, like hands, like eyelids, like the rows of the upper and lower teeth.” source