“Where is the proof, said I, that daemons may not be subjected to the control of men? This truth may be distorted and debased in the minds of the ignorant. The dogmas of the vulgar, with regard to this subject, are glaringly absurd; but though these may justly be neglected by the wise, we are scarcely justified in totally rejecting the possibility that man may obtain supernatural aid.”

Address to the Society for Psychical Research (1897)
Context: If a possible — nay, reasonable — variation in only one of the forces conditioning the human race, that of gravitation, could so modify our outward form, appearance, and proportions as to make us to all intents and purposes a different race of beings; if mere differences of size can cause some of the most simple facts in chemistry and physics to take so widely different a guise; if beings microscopically small and prodigiously large would simply as such be subject to the hallucinations I have pointed out, and to others I might enlarge upon, is it not possible that we, in turn, though occupying, as it seems to us, the golden mean, may also by the mere virtue of our size and weight fall into misinterpretations of phenomena from which we should escape were we or the globe we inhabit either larger or smaller, heavier or lighter? May not our boasted knowledge be simply conditioned by accidental environments, and thus be liable to a large element of subjectivity hitherto unsuspected and scarcely possible to eliminate?

No. 387
Characteristics, in the manner of Rochefoucauld's Maxims (1823)

Political Science for Civil Services Main Examination (2010)

Statement on the doorstep of 10 Downing Street, after her election as Prime Minister, as quoted at On this day (BBC) http://news.bbc.co.uk/onthisday/hi/dates/stories/may/4/newsid_2503000/2503195.stm. (This is a paraphrasing of a prayer commonly misattributed to St. Francis of Assisi.)
First term as Prime Minister
Source: [Who wrote Prayer of St. Francis? Doubtful it was friar, San Diego Union-Tribune, 27 January 2009, 28 July 2019, https://www.sandiegouniontribune.com/sdut-1n27prayer00320-who-wrote-prayer-st-francis-doubtf-2009jan27-htmlstory.html, Lord, make me an instrument of thy peace. Where there is hatred, let me sow love; Where there is injury, pardon; Where there is doubt, faith; Where there is despair, hope; Where there is darkness, light; Where there is sadness, joy.]
Source: [The real prayer of Francis of Assisi, Howse, Christopher, The Daily Telegraph, 12 April 2013, 28 July 2019, https://www.telegraph.co.uk/news/religion/9991301/The-real-prayer-of-Francis-of-Assisi.html, That was written in 1912, in French, and published in a pious magazine edited by Fr Esther Bouquerel. It was attributed to St Francis in 1927 through its having been printed on the back of a picture of the saint.]
Source: [Who wrote Prayer of St. Francis? Doubtful it was friar, San Diego Union-Tribune, 27 January 2009, 28 July 2019, https://www.sandiegouniontribune.com/sdut-1n27prayer00320-who-wrote-prayer-st-francis-doubtf-2009jan27-htmlstory.html, An article published last week in L'Osservatore Romano, the Vatican newspaper, said the prayer in its current form dates only from 1912, when it appeared in a French Catholic periodical. ... Although news to many, the truth about the prayer had apparently been hiding in plain sight. “No one among the Franciscans ever thought it really was by St. Francis,” said Giovanni Maria Vian, the editor of L'Osservatore Romano.]

The Development Hypothesis (1852)

Source: Utilitarianism (1861), Ch. 1

Book 1, Ch. 4 (as translated by LJ Walker and B Crick)
Discourses on Livy (1517)
Context: The demands of a free populace, too, are very seldom harmful to liberty, for they are due either to the populace being oppressed or to the suspicious that it is going to be oppressed... and, should these impressions be false, a remedy is provided in the public platform on which some man of standing can get up, appeal to the crowd, and show that it is mistaken. And though, as Tully remarks, the populace may be ignorant, it is capable of grasping the truth and readily yields when a man, worthy of confidence, lays the truth before it.

Source: The Analects, Chapter VI

Source: 1890s, The Principles of Psychology (1890), Ch. 8