“The brutality of a man purely motivated by monetary considerations … often does not appear to him at all as a moral delinquency, since he is aware only of a rigorously logical behavior, which draws the objective consequences of the situation.”

James G. March (1994), A Primer on Decision Making: How Decisions Happen, p. 57

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 267.

1964 Memorial Edition, p. 266 http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations/Profiles-in-Courage-quotations.aspx
Variant: A man does what he must — in spite of personal consequences, in spite of obstacles and dangers and pressures — and that is the basis of all human morality.
Source: Pre-1960, Profiles in Courage (1956)
Context: The courage of life is often a less dramatic spectacle than the courage of a final moment; but it is no less a magnificent mixture of triumph and tragedy. A man does what he must — in spite of personal consequences, in spite of obstacles and dangers, and pressures — and that is the basis of all human morality. In whatever area in life one may meet the challenges of courage, whatever may be the sacrifices he faces if he follows his conscience — the loss of his friends, his fortune, his contentment, even the esteem of his fellow men — each man must decide for himself the course he will follow. The stories of past courage can define that ingredient — they can teach, they can offer hope, they can provide inspiration. But they cannot supply courage itself. For this each man must look into his own soul.
Context: For without belittling the courage with which men have died, we should not forget those acts of courage with which men — such as the subjects of this book — have lived. The courage of life is often a less dramatic spectacle than the courage of a final moment; but it is no less a magnificent mixture of triumph and tragedy. A man does what he must — in spite of personal consequences, in spite of obstacles and dangers, and pressures — and that is the basis of all human morality. In whatever area in life one may meet the challenges of courage, whatever may be the sacrifices he faces if he follows his conscience — the loss of his friends, his fortune, his contentment, even the esteem of his fellow men — each man must decide for himself the course he will follow. The stories of past courage can define that ingredient — they can teach, they can offer hope, they can provide inspiration. But they cannot supply courage itself. For this each man must look into his own soul.

“Clinical and Cultural Aspects of the Aging Process,” p. 486
Individualism Reconsidered (1954)

Half-Truths and One-And-A-Half Truths (1976)

vol. 1, p. 131
The Nature and Destiny of Man: A Christian Interpretation (1941)

Instead we shall speak of the normative function of the thinking process, which can guide the pictorial elements of thinking into any logically permissible structure.
The Philosophy of Space and Time (1928, tr. 1957)

The Pragmatics of Patriotism (1973)
Context: Selfishness is the bedrock on which all moral behavior starts and it can be immoral only when it conflicts with a higher moral imperative. An animal so poor in spirit that he won't even fight on his own behalf is already an evolutionary dead end; the best he can do for his breed is to crawl off and die, and not pass on his defective genes.