“Better than big business is clean business.
To an honest man the most satisfactory reflection after he has amassed his dollars is not that they are many but that they are all clean.
What constitutes clean business? The answer is obvious enough, but the obvious needs restating every once in a while.
"A clean profit is one that has also made a profit for the other fellow."
This is fundamental moral axiom in business. Any gain that arises from another's loss is dirty.
Any business whose prosperity depends upon damage to any other business is a menace to the general welfare.
That is why gambling, direct or indirect, is criminal, why lotteries are prohibited by law, and why even gambling slot-machine devices are not tolerated in civilized countries. When a farmer sells a housekeeper a barrel of apples, when a milkman sells her a quart of milk, or the butcher a pound of steak, or the dry-goods man a yard of muslin, the housekeeper is benefited quite as much as those who get her money.
That is the type of honest, clean business, the kind that helps everybody and hurts nobody. Of course as business becomes more complicated it grows more difficult to tell so clearly whether both sides are equally prospered. No principle is automatic. It requires sense, judgment, and conscience to keep clean; but it can be done, nevertheless, if one is determined to maintain his self-respect. A man that makes a habit, every deal he goes into, of asking himself, "What is there in it for the other fellow?" and who refuses to enter into any transaction where his own gain will mean disaster to some one else, cannot go for wrong.
And no matter how many memorial churches he builds, nor how much he gives to charity, or how many monuments he erects in his native town, any man who has made his money by ruining other people is not entitled to be called decent. A factory where many workmen are given employment, paid living wages, and where health and life are conserved, is doing more real good in the world than ten eleemosynary institutions.
The only really charitable dollar is the clean dollar. And the nasty dollar, wrung from wronged workmen or gotten by unfair methods from competitors, is never nastier than when it pretends to serve the Lord by being given to the poor, to education, or to religion. In the long run all such dollars tend to corrupt and disrupt society.
Of all vile money, that which is the most unspeakably vile is the money spent for war; for war is conceived by the blundering ignorance and selfishness of rulers, is fanned to flame by the very lowest passions of humanity, and prostitutes the highest ideal of men; zeal for the common good; to the business of killing human beings and destroying the results of their collective work.”

It's not like it's all about me.
Interview in The Guardian (14 October 2000)

Presidential campaign (April 12, 2015 – 2016), Democratic Presidential Debate in Miami (March 9, 2016)

Book II, Chapter 3, p. 210 (See also: Karl Polanyi)
The Origin of Consciousness in the Breakdown of the Bicameral Mind (1976)
Context: Such trade was not, however, a true market. There were no prices under the pressures of supply and demand, no buying and selling, and no money. It was trade in the sense of equivalences established by divine decree. There is a complete lack of reference to business profits or loss in any of the cuneiform tablets that have been so far translated.

"The Face Game" (p.215)
So This Is Depravity (1980)

Source: The Incredible Shrinking Apple http://nytimes.com/2019/04/03/opinion/apple-steve-jobs.html in The New York Times (3 April 2019)

Where will you be allowed to make a profit in your industry? Where is the profit zone today? Where will it be tomorrow?
Source: The Profit Zone (2007), p. 3.

The Minister's Wooing (1859) Ch. 1 Pre-Railroad Times.
Context: He was called a good fellow, — only a little lumpish, — and as he was brave and faithful, he rose in time to be a shipmaster. But when came the business of making money, the aptitude for accumulating, George found himself distanced by many a one with not half his general powers. What shall a man do with a sublime tier of moral faculties, when the most profitable business out of his port is the slave-trade? So it was in Newport in those days. George's first voyage was on a slaver, and he wished himself dead many a time before it was over, — and ever after would talk like a man beside himself, if the subject was named. He declared that the gold made in it was distilled from human blood, from mothers' tears, from the agonies and dying groans of gasping, suffocating men and women, and that it would sear and blister the soul of him that touched it; in short, he talked as whole-souled, unpractical fellows are apt to talk about what respectable people sometimes do. Nobody had ever instructed him that a slaveship, with a procession of expectant sharks in its wake, is a missionary institution, by which closely. packed heathens are brought over to enjoy the light of the Gospel. So, though George was acknowledged to be a good fellow, and honest as the noon-mark on the kitchen floor, he let slip so many chances of making money as seriously to compromise his reputation among thriving folks. He was wastefully generous — insisted on treating every poor dog that came in his way, in any foreign port, as a brother — absolutely refused to be party in cheating or deceiving the heathen on any shore, or in skin of any color — and also took pains, as far as in him lay, to spoil any bargains which any of his subordinates founded on the ignorance or weakness of his fellow-men. So he made voyage after voyage, and gained only his wages and the reputation among his employers of an incorruptibly honest fellow.

Address to the annual conference of the Fiji Employers Federation, 2 September 2005

Peter de Noronha, The Pageant of Life (1964), Pages 134-135,
The Pageant of Life (1964), Businessmen