“Prosperity, both for individuals and for states, means possessions; and possessions mean burdens and harness and slavery; and slavery for the mind, too, because it is not only the rich man's time that is pre-empted, but his affections, his judgement, and the range of his thoughts.”

Art Nonsense and Other Essays (1929), published by Cassell; quoted in Eric Gill: Man of Flesh and Spirit by Malcolm Yorke, published by Tauris Parke ISBN 1-86064-584-4, p. 49

Essay on the Principle of Population (1798; rev. through 1826)

Vol. I, Ch. 11, pg. 336.
(Buch I) (1867)

Statement (26 June 1787) as quoted in Notes of the Secret Debates of the Federal Convention of 1787 http://avalon.law.yale.edu/18th_century/yates.asp by Robert Yates
1780s
Context: The man who is possessed of wealth, who lolls on his sofa or rolls in his carriage, cannot judge the wants or feelings of the day-laborer. The government we mean to erect is intended to last for ages. The landed interest, at present, is prevalent; but in process of time, when we approximate to the states and kingdoms of Europe, — when the number of landholders shall be comparatively small, through the various means of trade and manufactures, will not the landed interest be overbalanced in future elections, and unless wisely provided against, what will become of your government? In England, at this day, if elections were open to all classes of people, the property of landed proprietors would be insecure. An agrarian law would soon take place. If these observations be just, our government ought to secure the permanent interests of the country against innovation. Landholders ought to have a share in the government, to support these invaluable interests, and to balance and check the other. They ought to be so constituted as to protect the minority of the opulent against the majority. The senate, therefore, ought to be this body; and to answer these purposes, they ought to have permanency and stability.

The Educational Theory of Immanuel Kant (1904)
Context: Man has his own inclinations and a natural will which, in his actions, by means of his free choice, he follows and directs. There can be nothing more dreadful than that the actions of one man should be subject to the will of another; hence no abhorrence can be more natural than that which a man has for slavery. And it is for this reason that a child cries and becomes embittered when he must do what others wish, when no one has taken the trouble to make it agreeable to him. He wants to be a man soon, so that he can do as he himself likes.

Part III : Selection on Education from Kant's other Writings, Ch. I Pedagogical Fragments, # 62

Source: Anti-Intellectualism in American Life (1974), p. 30

Source: The Production of Security (1849), p. 20-21

1850s, Speech at Peoria, Illinois (1854)
Context: Slavery is founded in the selfishness of man's nature — opposition to it, in his love of justice. These principles are an eternal antagonism; and when brought into collision so fiercely, as slavery extension brings them, shocks, and throes, and convulsions must ceaselessly follow. Repeal the Missouri Compromise — repeal all compromises — repeal the Declaration of Independence — repeal all past history, you still can not repeal human nature. It still will be the abundance of man's heart, that slavery extension is wrong; and out of the abundance of his heart, his mouth will continue to speak.