“Contemporary with Vitellio and Peccam was… Roger Bacon, a man of almost universal genius, and who wrote on almost every branch of science. He frequently quotes Alhazen on the subject of optics, and seems to have carefully studied his writings, as well as those of other Arabians, which were the fountains of natural knowledge in those days, and which had been introduced into Europe by means of the Moors in Spain. Notwithstanding the pains this great man took with the subject of opticks, it does not appear that, with respect to theory, he made any considerable advance upon what Alhazen had done before him.”

— Joseph Priestley

Period I To the Revival of Letters in Erope
The History and Present State of Discoveries Relating to Vision, Light, and Colours (1772)

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Joseph Priestley47

English theologian, chemist, educator, and political theori… 1733–1804

Cecil Roth (1899–1970) British historian

Source: A History of the Jews in England (3rd ed. 1964), p. 126

“I write to thee on this subject, [friend], because I am angry at a book which I have just left, which is so large, that it seems to contain universal science, but it hath almost split my head, without teaching me anything.”

Montesquieu (1689–1755) French social commentator and political thinker

No. 66.
Lettres Persanes (Persian Letters, 1721)

“All the men who are now called discoverers, in every matter ruled by thought, have been men versed in the minds of their predecessors, and learned in what had been before them. There is not one exception. I do not say that every man has made direct acquantance with the whole of his mental ancestry… But… it is remarkable how many of the greatest names in all departments of knowledge have been real antiquaries in their several subjects.
I may cite among those… in science, Aristotle, Plato, Ptolemy, Euclid, Archimedes, Roger Bacon, Copernicus, Francis Bacon, Ramus, Tycho Brahe, Galileo, Napier, Descartes, Leibnitz, Newton, Locke.”

Augustus De Morgan (1806–1871) British mathematician, philosopher and university teacher (1806-1871)

A Budget of Paradoxes (1872)

“There are, first of all, two kinds of authors: those who write for the subject’s sake, and those who write for writing’s sake. The first kind have had thoughts or experiences which seem to them worth communicating, while the second kind need money and consequently write for money.”

Arthur Schopenhauer (1788–1860) German philosopher

Essays, On Authorship and Style

“Religion is a subject on which I have ever been most scrupulously reserved. I have considered it as a matter between every man and his Maker in which no other, and far less the public, had a right to intermeddle.”

Thomas Jefferson (1743–1826) 3rd President of the United States of America

Letter to Richard Rush (1813)
1810s

“To the British subject who fancies genius may be lodged in him, this liberty remains; and truly it is, if well computed, almost the only one he has.”

Thomas Carlyle (1795–1881) Scottish philosopher, satirical writer, essayist, historian and teacher

1850s, Latter-Day Pamphlets (1850), Stump Orator (May 1, 1850)
Context: If the young aspirant is not rich enough for Parliament, and is deterred by the basilisks or otherwise from entering on Law or Church, and cannot altogether reduce his human intellect to the beaverish condition, or satisfy himself with the prospect of making money,—what becomes of him in such case, which is naturally the case of very many, and ever of more? In such case there remains but one outlet for him, and notably enough that too is a talking one: the outlet of Literature, of trying to write Books. Since, owing to preliminary basilisks, want of cash, or superiority to cash, he cannot mount aloft by eloquent talking, let him try it by dexterous eloquent writing. Here happily, having three fingers, and capital to buy a quire of paper, he can try it to all lengths and in spite of all mortals: in this career there is happily no public impediment that can turn him back; nothing but private starvation—which is itself a finis or kind of goal—can pretend to hinder a British man from prosecuting Literature to the very utmost, and wringing the final secret from her: "A talent is in thee; No talent is in thee." To the British subject who fancies genius may be lodged in him, this liberty remains; and truly it is, if well computed, almost the only one he has.