Individualism and Socialism (1933)
Context: Was Tolstoy justified in interpreting the Sermon on the Mount in anarchistic terms? The answer cannot be found in isolated texts or combinations thereof, but rather in consideration of the basic elements which together constitute the religion of Jesus.... The Golden Rule of conduct was phrased in terms of mutuality: "do unto others as you would have them do unto you." The true criterion of every thought and deed must, therefore, be found in its effects upon human personality, human relations, and communion between man and God.
“They do not feel bound by the customary rules of conduct and have not yet found an inner law that would replace them.”
On artists whom she had often found of rather loose morals, quoted in "Paris (1897-1904)" and in Mother India, Volume 20 (1968) http://books.google.co.in/books?id=YifkAAAAMAAJ, p. 46
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The Mother 41
spiritual collaborator of Sri Aurobindo 1878–1973Related quotes

“Methodological rules are for science what rules of law and custom are for conduct.”
Source: The Division of Labor in Society (1893), p. 364

Remark (undated) to William Temple, quoted in Robert Speaight, The Life of Hilaire Belloc (London: Hollis & Carter, 1957), p. 383

2010s, Liberty University Speech (14 September 2015)

Ten Sermons of Religion (1853), III : Of Justice and the Conscience https://en.wikisource.org/wiki/Ten_Sermons_of_Religion/Of_Justice_and_the_Conscience
Context: Justice is the constitution or fundamental law of the moral universe, the law of right, a rule of conduct for man in all his moral relations. Accordingly all human affairs must be subject to that as the law paramount; what is right agrees therewith and stands, what is wrong conflicts and falls. Private cohesions of self-love, of friendship, or of patriotism, must all be subordinate to this universal gravitation towards the eternal right.

1780s, Letter to Peter Carr (1787)
Context: He who made us would have been a pitiful bungler, if he had made the rules of our moral conduct a matter of science. For one man of science, there are thousands who are not. What would have become of them? Man was destined for society. His morality, therefore, was to be formed to this object. He was endowed with a sense of right and wrong, merely relative to this.

2009, Nobel Prize acceptance speech (December 2009)
Variant: There is one rule that lies at the heart of every religion: that we do unto others as we would have them do unto us. This truth transcends nations and peoples
Context: The one rule that lies at the heart of every major religion is that we do unto others as we would have them do unto us.
Adhering to this law of love has always been the core struggle of human nature. For we are fallible. We make mistakes, and fall victim to the temptations of pride, and power, and sometimes evil. Even those of us with the best of intentions will at times fail to right the wrongs before us.

Dissent, Burdeau v. McDowell, 256 U.S. 465, 477 (1921).
Judicial opinions

Cowan v. Duke of Buccleuch (1876), L. R. 2 Ap. Ca. 355.