“All of our problems are the result of overbreeding among the working class, and if morality is to mean anything at all to us, we must regard all the changes which tend toward the uplift and survival of the human race as moral.”
"Morality and Birth Control", February-March, 1918, pp. 11,14.
Birth Control Review, 1918-32
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Margaret Sanger 61
American birth control activist, educator and nurse 1879–1966Related quotes

The Pragmatics of Patriotism (1973)
Context: I now define "moral behavior" as "behavior that tends toward survival." I won't argue with philosophers or theologians who choose to use the word "moral" to mean something else, but I do not think anyone can define "behavior that tends toward extinction" as being "moral" without stretching the word "moral" all out of shape.

Attributed in posthumous publications, Einstein and Religion (1999)
Context: It seems to me that the idea of a personal God is an anthropomorphic concept which I cannot take seriously. I feel also not able to imagine some will or goal outside the human sphere. My views are near to those of Spinoza: admiration for the beauty of and belief in the logical simplicity of the order and harmony which we can grasp humbly and only imperfectly. I believe that we have to content ourselves with our imperfect knowledge and understanding and treat values and moral obligations as a purely human problem—the most important of all human problems.
From a letter to Murray W. Gross (26 April 1947), p. 138
Source: The Principles of State and Government in Islam (1961), Chapter 6: Conclusion, p 95

Letter to Mary Gladstone (1881)

Nobel Peace Prize acceptance (1985)
Context: We physicians who shepherd human life from birth to death have a moral imperative to resist with all our being the drift toward the brink. The threatened inhabitants on this fragile planet must speak out for those yet unborn, for posterity has no lobby with politicians.
Steve Sapontzis, " Dicussion: Environmental Ethics and the Locus of Value https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=2060&context=bts", Between the Species (Winter 1990), p. 9

1980s and later, Knowledge, Evolution and Society (1983), "Coping with Ignorance", "Our Moral Heritage"

2000s, God Bless America (2008), Slavery and the American Cause