“To speak of 'limits to growth' under a capitalistic market economy is as meaningless as to speak of limits of warfare under a warrior society. The moral pieties, that are voiced today by many well-meaning environmentalists, are as naive as the moral pieties of multinationals are manipulative. Capitalism can no more be 'persuaded' to limit growth than a human being can be 'persuaded' to stop breathing. Attempts to 'green' capitalism, to make it 'ecological', are doomed by the very nature of the system as a system of endless growth.”

"The Reasons for My Involvement in the Peace Movement" (1972) http://www.shalomctr.org/node/61; later included in Moral Grandeur and Spiritual Audacity (1996)
Context: There is immense silent agony in the world, and the task of man is to be a voice for the plundered poor, to prevent the desecration of the soul and the violation of our dream of honesty.
The more deeply immersed I became in the thinking of the prophets, the more powerfully it became clear to me what the lives of the Prophets sought to convey: that morally speaking, there is no limit to the concern one must feel for the suffering of human beings, that indifference to evil is worse than evil itself, that in a free society, some are guilty, but all are responsible.

Moral Influence
The Note-Books of Samuel Butler (1912), Part VI - Mind and Matter

Source: Let Your Life Speak: Listening for the Voice of Vocation (1999), p. 50

Source: Soil Not Oil: Environmental Justice in an Age of Climate Crisis

Source: The Cultural Contradictions of Capitalism (1976), Chapter 6, The Public Household, p. 223

“Objectivism and the State: An Open Letter to Ayn Rand,” 1969

Less is More: How Degrowth Will Save the World (2021)
Source: Pathways to a Post-Capitalist World, p. 207

What I Saw in America (1922)
Context: The truth is that prohibitions might have done far less harm as prohibitions, if a vague association had not arisen, on some dark day of human unreason, between prohibition and progress. And it was the progress that did the harm, not the prohibition. Men can enjoy life under considerable limitations, if they can be sure of their limited enjoyments; but under Progressive Puritanism we can never be sure of anything. The curse of it is not limitation; it is unlimited limitation. The evil is not in the restriction; but in the fact that nothing can ever restrict the restriction. The prohibitions are bound to progress point by point; more and more human rights and pleasures must of necessity be taken away; for it is of the nature of this futurism that the latest fad is the faith of the future, and the most fantastic fad inevitably makes the pace. Thus the worst thing in the seventeenth-century aberration was not so much Puritanism as sectarianism. It searched for truth not by synthesis but by subdivision. It not only broke religion into small pieces, but it was bound to choose the smallest piece.

"Fads and Public Opinion"