“Forgive him, for he believes that the customs of his tribe are the laws of nature!”
Act II; sometimes paraphrased as: The customs of your tribe are not laws of nature.
1890s, Caesar and Cleopatra (1898)
Variant: Pardon him, Theodotus: he is a barbarian, and thinks that the customs of his tribe and island are the laws of nature.
Context: THEODOTUS: Caesar: you are a stranger here, and not conversant with our laws. The kings and queens of Egypt may not marry except with their own royal blood. Ptolemy and Cleopatra are born king and consort just as they are born brother and sister.
BRITANNUS (shocked): Caesar: this is not proper.
THEODOTUS (outraged): How!
CAESAR (recovering his self-possession): Pardon him, Theodotus: he is a barbarian, and thinks that the customs of his tribe and island are the laws of nature.
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George Bernard Shaw 413
Irish playwright 1856–1950Related quotes

The Callahan Chronicals <!-- [Sic] -->(1996) [originally published as Callahan and Company (1988)] "Backword", p. xii
Context: In a culture where pessimism has metastasized like slow carcinoma, that crazy Irishman was backward enough to try to raise hopes, like hothouse flowers. In an era during which even judicious use of alcohol has been increasingly bad-rapped, the man who came to be known as The Mick of Time was backward enough to think that the world can look just that essential tad better when seen through a flask, brightly. (As long as you let someone else drive you home afterward.) Above all, he — and his goofball customers — believed that shared pain is lessened, and shared Joy increased.
Now he is gone. Gone back whence he came, and we are all the poorer for it. But I refuse to say that we will not see his like again. Or his love again.

“The laws of conscience, which we pretend to be derived from nature, proceed from custom.”
Book I, Ch. 22. Of Custom
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)

§ 228
The Reasonableness of Christianity (1695)

Riyadh-as-Saliheen by Imam Al-Nawawi, volume 3, hadith number 433
Sunni Hadith

Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995), New Rules for the New Economy: 10 Radical Strategies for a Connected World (1999)

Section 6 : Higher Life
Life and Destiny (1913)