“First, without reference to England, looking at all countries, I say that it is the first duty of the Minister, and the first interest of the State, to maintain a balance between the two great branches of national industry; that is a principle which has been recognised by all great Ministers for the last two hundred years…Why we should maintain that balance between the two great branches of national industry, involves political considerations—social considerations, affecting the happiness, prosperity, and morality of the people, as well as the stability of the State. But I go further; I say that in England we are bound to do more—I repeat what I have repeated before, that in this country there are special reasons why we should not only maintain the balance between the two branches of our national industry, but why we should give a preponderance…to the agricultural branch; and the reason is, because in England we have a territorial Constitution. We have thrown upon the land the revenues of the Church, the administration of justice, and the estate of the poor; and this has been done, not to gratify the pride, or pamper the luxury of the proprietors of the land, but because, in a territorial Constitution, you, and those whom you have succeeded, have found the only security for self-government—the only barrier against that centralising system which has taken root in other countries.”

Book II, Chapter I, On The Progress of Wealth, Section IX, p. 412-413
Principles of Political Economy (Second Edition 1836)

Presidential campaign, 2013

Carl MacDougall, "Reformers and radicals in Scottish literature" http://www.bbc.co.uk/scotland/arts/writingscotland/learning_journeys/reformers_and_radicals/.
Criticism

Free Speech and Plain Language (1936)
Context: Get up in one of our industrial centres today and say that two and two make four, and if there is any financial interest concerned in maintaining that two and two make five, the police will bash your head in. Then what choice have you, save to degenerate either into a fool or into a hypocrite? And who wants to live in a land of fools and hypocrites?

Source: Democracy in America, Volume I (1835), Chapter XV-IXX, Chapter XVIII.

Speech to the Western Society of Engineers (18 September 1901); published in the Journal of the Western Society of Engineers (December 1901); republished with revisions by the author for the Annual Report of the Board of Regents of the Smithsonian Institution (1902)
Context: Herr Otto Lilienthal seems to have been the first man who really comprehended that balancing was the first instead of the last of the great problems in connection with human flight. He began where others left off, and thus saved the many thousands of dollars that it had theretofore been customary to spend in building and fitting expensive engines to machines which were uncontrollable when tried. He built a pair of wings of a size suitable to sustain his own weight, and made use of gravity as his motor. This motor not only cost him nothing to begin with, but it required no expensive fuel while in operation, and never had to be sent to the shop for repairs. It had one serious drawback, however, in that it always insisted on fixing the conditions under which it would work. These were, that the man should first betake himself and machine to the top of a hill and fly with a downward as well as a forward motion. Unless these conditions were complied with, gravity served no better than a balky horse — it would not work at all...
We figured that Lilienthal in five years of time had spent only about five hours in actual gliding through the air. The wonder was not that he had done so little, but that he had accomplished so much. It would not be considered at all safe for a bicycle rider to attempt to ride through a crowded city street after only five hours’ practice, spread out in bits of ten seconds each over a period of five years; yet Lilienthal with this brief practice was remarkably successful in meeting the fluctuations and eddies of wind gusts. We thought that if some method could be found by which it would be possible to practice by the hour instead of by the second there would be hope of advancing the solution of a very difficult problem.

Source: Speech in the House of Lords (20 February 1877), cited in William Flavelle Monypenny and George Earle Buckle, The Life of Benjamin Disraeli, Earl of Beaconsfield. Volume II. 1860–1881 (London: John Murray, 1929), p. 994.

The Cornerstone Speech (1861)