“If it is traumatising to follow the same lecture every week, then what makes it desirable to sit in the same place daily?”

'Excerpts from the Teaching of Hans Hofmann', p. 61
Search for the Real and Other Essays (1948)

Here, Seneca uses the same observation that Sallust made regarding friendship (in his historical account of the Catilinarian conspiracy, Bellum Catilinae[XX.4]) to define wisdom.
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XX: On practicing what you preach, Line 5

The New Day: Campaign Speeches of Herbert Hoover (1928), Campaign speech in New York (22 October 1928)
Context: Bureaucracy is ever desirous of spreading its influence and its power. You cannot extend the mastery of the government over the daily working life of a people without at the same time making it the master of the people's souls and thoughts. Every expansion of government in business means that government in order to protect itself from the political consequences of its errors and wrongs is driven irresistibly without peace to greater and greater control of the nation's press and platform. Free speech does not live many hours after free industry and free commerce die.

Source: Pretties

Rečnik od tri jezika: s. makedonski, arbanski i turski [Dictionary of Three languages: Macedonian, Albanian, Turkish], U držacnoj štampariji, 1875, p. 48f.

Source: The Demon-Haunted World : Science as a Candle in the Dark (1995), Ch. 25 : Real Patriots Ask Questions
Context: When we consider the founders of our nation: Jefferson, Washington, Samuel and John Adams, Madison and Monroe, Benjamin Franklin, Tom Paine and many others; we have before us a list of at least ten and maybe even dozens of great political leaders. They were well educated. Products of the European Enlightenment, they were students of history. They knew human fallibility and weakness and corruptibility. They were fluent in the English language. They wrote their own speeches. They were realistic and practical, and at the same time motivated by high principles. They were not checking the pollsters on what to think this week. They knew what to think. They were comfortable with long-term thinking, planning even further ahead than the next election. They were self-sufficient, not requiring careers as politicians or lobbyists to make a living. They were able to bring out the best in us. They were interested in and, at least two of them, fluent in science. They attempted to set a course for the United States into the far future — not so much by establishing laws as by setting limits on what kinds of laws could be passed. The Constitution and its Bill of Rights have done remarkably well, constituting, despite human weaknesses, a machine able, more often than not, to correct its own trajectory. At that time, there were only about two and a half million citizens of the United States. Today there are about a hundred times more. So if there were ten people of the caliber of Thomas Jefferson then, there ought to be 10 x 100 = 1,000 Thomas Jefferson's today. Where are they?

Source: Antifragile: Things That Gain from Disorder (2012), p. 127

i.254-255
Paradise Lost (1667)
Variant: The mind is its own place, and in itself
Can make a heav'n of hell, a hell of heav'n.
Source: Paradise Lost: Books 1-2

Source: Oryx and Crake