“There are certain great sentiments which simultaneously possess many minds and make what we call the spirit of the age. That spirit at the close of the last century was peculiarly humane. From the great Spanish Cardinal Ximenes, who refused the proposal of the Bishop Las Casas to enslave the Indians; from Milton, who sang, 'But man over man He made not Lord; such title to himself Reserving, human left from human free', from John Selden, who said, 'Before all, Liberty', from Algernon Sidney, who died for it, from Morgan Godwyn, a clergyman of the Established Church, and Richard Baxter, the Dissenter, with his great contemporary, George Fox, whose protest has been faithfully maintained by the Quakers; from Southern, Montesquieu, Hutcheson, Savage, Shenstone, Sterne, Warburton, Voltaire, Rosseau, down to Cowper and Clarkson in 1783 — by the mouths of all these and innumerable others Religion, Scepticism, Literature, and Wit had persistently protested against the sin of slavery. As early as 1705 Lord Holt had declared there was no such thing as a slave by the law of England. At the close of the century, four years before our Declaration, Lord Mansfield, though yearning to please the planters, was yet compelled to utter the reluctant 'Amen' to the words of his predecessor. Shall we believe Lord Mansfield, who lived in the time and spoke for it, when he declared that wherever English law extended — and it extended to these colonies — there was no man whatsoever so poor and outcast but had rights sacred as the king's; or shall we believe a judge eighty-four years afterwards, who says that at that time Africans were regarded as people 'who had no rights which the white man was bound to respect?”

Philosophy of Freedom. Chapter 14

Quote in a letter to Delacroix' friend J. B. Pierret, 23 October 1818, from the Forest of Boixe; as quoted in Eugene Delacroix – selected letters 1813 – 1863, ed. and transl. Jean Stewart, art Works MFA publications, Museum of Fine Art Boston, 2001, p. 43
1815 - 1830

Letter to Morris Raphael Cohen, professor emeritus of philosophy at the College of the City of New York, defending the appointment of Bertrand Russell to a teaching position (19 March 1940).
1940s
Variant: Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence and fulfills the duty to express the results of his thoughts in clear form.

Period I To the Revival of Letters in Erope
The History and Present State of Discoveries Relating to Vision, Light, and Colours (1772)
Context: Great as Bacon was, he was far from being free from the mistakes and prejudices of those who went before him. Even some of the most wild and absurd opinions of the antients have the sanction of his approbation and authority. He does not hesitate to assent to an opinion... that visual rays proceed from the eye; giving this reason for it, that every thing in nature is qualified to discharge its proper functions by its own powers, in the same manner as the sun, and other celestial bodies. He acknowledges, however, that the presence of light, as well as several other circumstances, is necessary to vision.

Source: Fight Club

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 258.

"The Bull-Fight" from Essays from Epilogue (Manchester: Carcanet, 2001)

Self-Culture (1838)

Van Gogh, the Man Suicided by Society (1947)