“You are right in speaking of the moral foundations of science, but you cannot turn around and speak of the scientific foundations of morality.”
"Physics and Reality" in the Journal of the Franklin Institute Vol. 221, Issue 3 (March 1936), Pages 349-382
1930s
Context: It has often been said, and certainly not without justification, that the man of science is a poor philosopher. Why then should it not be the right thing for the physicist to let the philosopher do the philosophizing? Such might indeed be the right thing to do at a time when the physicist believes he has at his disposal a rigid system of fundamental laws which are so well established that waves of doubt can't reach them; but it cannot be right at a time when the very foundations of physics itself have become problematic as they are now. At a time like the present, when experience forces us to seek a newer and more solid foundation, the physicist cannot simply surrender to the philosopher the critical contemplation of theoretical foundations; for he himself knows best and feels more surely where the shoe pinches. In looking for an new foundation, he must try to make clear in his own mind just how far the concepts which he uses are justified, and are necessities.
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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955Related quotes

“The foundation of morality is to have done, once and for all, with lying”
"Science and Morals" (1886) http://aleph0.clarku.edu/huxley/CE9/S-M.html
1880s
Context: The foundation of morality is to have done, once and for all, with lying; to give up pretending to believe that for which there is no evidence, and repeating unintelligible propositions about things beyond the possibilities of knowledge.

[Chattanooga Times Free Press, 2004-02-22], quoted in * Herman Cain's 2004 Campaign: 'Godless' Gays And Planned Parenthood Eugenics
Huffington Post
Sam
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http://www.huffingtonpost.com/2011/10/05/herman-cain-abortion-planned-parenthood-2004-campaign_n_996631.html
2011-10-15
on Georgia constitutional amendment banning same-sex marriage

Sermon VII : Outward and Inward Morality
Meister Eckhart’s Sermons (1909)
Context: All true morality, inward and outward, is comprehended in love, for love is the foundation of all the commandments.
All outward morality must be built upon this basis, not on self-interest. As long as man loves something else than God, or outside God, he is not free, because he has not love. Therefore there is no inner freedom which does not manifest itself in works of love. True freedom is the government of nature in and outside man through God; freedom is essential existence unaffected by creatures. But love often begins with fear; fear is the approach to love: fear is like the awl which draws the shoemaker's thread through the leather.
The 5,000 Year Leap (1981)

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 34.

Source: The Autobiography of William Cobbett (1933), Ch. 12, pp. 185-186.