“I only wish to have the principle recognized that no man liveth to himself; that no man's business is his business alone; that all business is stewardship; that there is no law of life but Christ's law; that the main question for every man is not how much he can get, but how much he can give.”

Source: Meditations (c. 121–180 AD), Book VII, 3

The Man who Tapped the Secrets of the Universe

Source: The Life of Samuel Johnson LL.D. Vol 3

Source: The Spiritual Life (1947), p. 267
Context: The ethic of reverence for life constrains all, in whatever walk of life they may find themselves, to busy themselves intimately with all the human and vital processes which are being played out around them, and to give themselves as men to the man who needs human help and sympathy. It does not allow the scholar to live for his science alone, even if he is very useful to the community in so doing. It does not permit the artist to exist only for his art, even if he gives inspiration to many by its means. It refuses to let the business man imagine that he fulfills all legitimate demands in the course of his business activities. It demands from all that they should sacrifice a portion of their own lives for others. In what way and in what measure this is his duty, this everyone must decide on the basis of the thoughts which arise in himself, and the circumstances which attend the course of his own life. The self-sacrifice of one may not be particularly in evidence. He carries it out simply by continuing his normal life. Another is called to some striking self-surrender which obliges him to set on one side all regard for his own progress. Let no one measure himself by his conclusions respecting someone else. The destiny of men has to fulfill itself in a thousand ways, so that goodness may be actualized. What every individual has to contribute remains his own secret. But we must all mutually share in the knowledge that our existence only attains its true value when we have experienced in ourselves the truth of the declaration: 'He who loses his life shall find it.

"Postscript", p. 153.
The Anarchist Cookbook (1971)
Context: If people depend on the state to make laws, to prevent themselves from doing what they really want to do, then I say these people are nuts. I mean to say, if I really want to do something, I don't particularly care if it's legal, illegal, moral, immoral, or amoral. I want to do it, so I do it. The only laws a man can truly respect are the ones he makes for himself.

Law.
Table Talk (1689)

Pericles commenting the participation of Athenian citizens in politics, as quoted in Models of Democracy (2006) by David Held, Stanford University Press, p. 14. Book II, chapter 40.

Man's Search for Meaning (1946; 1959; 1984)