“The greatest liberty is born of the greatest rigor.”

Hayek's Journey: The Mind of Friedrich Hayek (2003)
Context: Hayek died in Freiburg, Germany, on March 23, 1992, less than two months shy of his ninety-third birthday. After 1985, he was unable to work and lost contact with almost all friends and associates. In his last years, almost the only people with whom he had regular contact were his wife, Helene; secretary Charlotte Cubitt, whom he always called “Mrs. Cubitt”; children Larry and Christine Hayek; and Bartley. Hayek was grateful to Cubitt for her assistance from 1977 to 1992. He inscribed in her copy of The Fatal Conceit in 1990: “In gratitude for all her help over so many years F. A. Hayek.”
During his last years, he had periods of more and less lucidity, as well as being ill and depressed. Lord Harris of the Institute of Economic Affairs wrote in his obituary of Hayek that “by 1989 the great man had lost touch with affairs.” He was buried in Vienna, the place of his birth.
[... ] Friedrich Hayek was the greatest political philosopher of liberty during the twentieth century.

Dissenting, Olmstead v. United States, 277 U.S. 438, 479 (1928). The last sentence is one of many quotations inscribed on Cox Corridor II, a first floor House corridor, U.S. Capitol.
Judicial opinions
Context: The defendants' objections to the evidence obtained by wire-tapping must, in my opinion, be sustained. It is, of course, immaterial where the physical connection with the telephone wires leading into the defendants' premises was made. And it is also immaterial that the intrusion was in aid of law enforcement. Experience should teach us to be most on our guard to protect liberty when the government's purposes are beneficent. Men born to freedom are naturally alert to repel invasion of their liberty by evil-minded rulers. The greatest dangers to liberty lurk in insidious encroachment by men of zeal, well-meaning but without understanding.

Legislative Assembly, February 9, 1865
Context: The two greatest things that all men aim at in any free government are liberty and permanency. We have had liberty enough - too much perhaps in some respects - but at all events, liberty to our hearts content.

Time magazine (12 February 1979)

Source: Reminiscences (1964), p. 417

Reflections on the Revolution in France (1790)

"Nationality" (1862)

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XIII: On Groundless Fears

Article on Government
L'Encyclopédie (1751-1766)