Source: Mathematical Thought from Ancient to Modern Times (1972), p. 580
Context: Fermat knew that under reflection light takes the path requiring least time and, convinced that nature does indeed act simply and economically, affirmed in letters of 1657 and 1662 his Principle of Least Time, which states that light always takes the path requiring least time. He had doubted the correctness of the law of refraction of light but when he found in 1661 that he could deduce it from his Principle, he not only resolved his doubts about the law but felt all the more certain that his Principle was correct.... Huygens, who had at first objected to Fermat's Principle, showed that it does hold for the propagation of light in media with variable indices of refraction. Even Newton's first law of motion, which states that the straight line or shortest distance is the natural motion of a body, showed nature's desire to economize. These examples suggested that there might be a more general principle. The search for such a principle was undertaken by Maupertuis.
“In gathering the materials of International law, he had to go beyond national treaties and denominational interests, for a principle embracing all mankind. The principles of law must stand, he said, even if we suppose that there is no God.”
The History of Freedom in Christianity (1877)
Context: The French philosopher Charron was one of the men least demoralised by party spirit, and least blinded by zeal for a cause. In a passage almost literally taken from St. Thomas, he describes our subordination under the law of nature, to which all legislation must conform; and he ascertains it not by the light of revealed religion, but by the voice of universal reason, through which God enlightens the consciences of men. Upon this foundation Grotius drew the lines of real political science. In gathering the materials of International law, he had to go beyond national treaties and denominational interests, for a principle embracing all mankind. The principles of law must stand, he said, even if we suppose that there is no God. By these inaccurate terms he meant that they must be found independently of Revelation. From that time it became possible to make politics a matter of principle and of conscience, so that men and nations differing in all other things could live in peace together, under the sanctions of a common law.
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John Dalberg-Acton, 1st Baron Acton 112
British politician and historian 1834–1902Related quotes

Speech in West Calder, Scotland (27 November 1879), quoted in W. E. Gladstone, Midlothian Speeches 1879 (Leicester University Press, 1971), p. 123.
1870s

Source: Guide for the Perplexed (c. 1190), Part III, Ch.25
Context: It is not unreasonable to assume that the works of God, their existence and preceding non-existence, are the result of His wisdom, but we are unable to understand many of the ways of His Wisdom in His works. On this principle the whole Law of Moses is based; it begins with this principle: "And God saw all that He had made, and behold, it was very good" (Gen. i. 31); and it ends with this principle: "The Rock, perfect is His work" (Deut. xxxii. 4). Note it.

(1974, opposing détente) " CNN Cold War http://www.cnn.com/SPECIALS/cold.war/episodes/16/script.html", Episode 16: Détente, Episode Script. Retrieved June 2, 2006.

The Education of Henry Adams (1907)
Remarks made at the launch of the Navua branch of the NAP, 4 June 2005

“We are ignorant of the laws of variety-production; but we see it going on as a principle in nature”
Source: Vestiges of the Natural History of Creation (1844), p. 283
Context: We are ignorant of the laws of variety-production; but we see it going on as a principle in nature, and it is obviously favorable to the supposition that all the great families of men are of one stock.

Report of the Independent Expert on the promotion of a democratic and equitable international order on the right of self determination http://www.ohchr.org/EN/Issues/IntOrder/Pages/Reports.aspx.
2015, Report submitted to the UN General Assembly

VIII 2, as quoted in The Acentric Labyrinth (1995) by Ramon Mendoza
De immenso (1591)

21 September 1830
Table Talk (1821–1834)