“[…] men are not astonish'd at the operations of their own reason, at the same time, that they admire the instinct of animals, and find a difficulty in explaining it, merely because it cannot be reduc'd to the very same principles. […] reason is nothing but a wonderful and unintelligible instinct in our souls[. ]”

The Education of Henry Adams (1907)

London 1759, p. 28 books.google https://books.google.de/books?id=h1IJAAAAQAAJ&pg=PA28&dq=mysteries
Conjectures on Original Composition (1759)

How we love to play with words that please our pride;
Our noble race's mean descent by false forged titles seek to hide! <p> For "gift divine" I bid you read the better work of higher brain,
From Instinct diff'ering in degree as golden mine from leaden vein.
The Kasîdah of Hâjî Abdû El-Yezdî (1870)

Source: The Power and the Glory

p. 44 http://books.google.com/books?id=W6bPGIL-_-8C&pg=PA44&dq=%22On+second+thought,+maybe+the+atheist%22: Sometimes misattributed to Francis Thompson, whose quote "An atheist is a man who believes himself an accident" Peter was commenting on.
Peter's Quotations: Ideas for Our Time (1977)

12 September 1936, Advice to the pupils of the Bishop Cotton School, Simla, also quoted in Speeches and Statements of the Marquess of Linlithgow, p. 19-20

"Anarchism" article in Encyclopedia Britannica (1910) "The Historical Development of Anarchism", as quoted in Anarchism: A Collection of Revolutionary Writings (1927), p. 288
Context: The best exponent of anarchist philosophy in ancient Greece was Zeno (342-267 or 270 B. C.), from Crete, the founder of the Stoic philosophy, who distinctly opposed his conception of a free community without government to the state-Utopia of Plato. He repudiated the omnipotence of the State, its intervention and regimentation, and proclaimed the sovereignty of the moral law of the individual — remarking already that, while the necessary instinct of self-preservation leads man to egotism, nature has supplied a corrective to it by providing man with another instinct — that of sociability. When men are reasonable enough to follow their natural instincts, they will unite across the frontiers and constitute the Cosmos. They will have no need of law-courts or police, will have no temples and no public worship, and use no money — free gifts taking the place of the exchanges. Unfortunately, the writings of Zeno have not reached us and are only known through fragmentary quotations. However, the fact that his very wording is similar to the wording now in use, shows how deeply is laid the tendency of human nature of which he was the mouthpiece.

Source: The Characteristics of the Present Age (1806), p. 8