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.
“It is doubtful whether the artist [unknown] altogether knew what he depicted here in this panel, and even more doubtful whether he could have expressed it in words. That which we praise here as well thought-out and cleverly arranged may, in fact, have been achieved by him unconsciously; for the artist was transformed by pure harmoniousness while executing this picture, and his feeling become his law. Only his disposition, his spiritual exaltation, could have brought forth such a fruit as this picture. Just as the pious man prays without speaking a word and the Almighty hearkens unto him, so the artist with true feeling paints and the sensitive man understands and recognizes it; while even the less sensitive gain some inkling of it.”
cited in: Vaughan, William-Börsch-Supan, Helmut- Neidhardt, Hans Joachim, Caspar David Friedrich. 1774-1840. Romantic Landscape Painting in Dresden, London, The Tate gallery, 1972, p. 104
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