“Liberty is not merely a privilege to be conferred; it is a habit to be acquired.”

Book II, 2.40-[3]
History of the Peloponnesian War, Book II
Context: Again, in our enterprises we present the singular spectacle of daring and deliberation, each carried to its highest point, and both united in the same persons; although usually decision is the fruit of ignorance, hesitation of reflection. But the palm of courage will surely be adjudged most justly to those, who best know the difference between hardship and pleasure and yet are never tempted to shrink from danger. In generosity we are equally singular, acquiring our friends by conferring, not by receiving, favours.

Diary of an Unknown (1988), On Invisibility
Context: Beauty is always the result of an accident. Of a violent lapse between acquired habits and those yet to be acquired. It baffles and disgusts. It may even horrify. Once the new habit has been acquired, the accident ceases to be an accident. It becomes classical and loses its shock value.

1990s, A Distinctly American Internationalism (November 1999)

Original: (it) Mettersi in gioco è il privilegio di chi non ama l'abitudine.
Source: prevale.net

"Federalism, Socialism, Anti-Theologism" http://www.marxists.org/reference/archive/bakunin/works/various/reasons-of-state.htm, presented by Bakunin as a Reasoned Proposal to the Central Committee of the League for Peace and Freedom, at the League's first congress held in Geneva (September 1867).
Variant translation: We are convinced that freedom without Socialism is privilege and injustice, and that Socialism without freedom is slavery and brutality.
As quoted in The Political Philosophy of Bakunin: Scientific Anarchism (1953) edited by Grigoriĭ Petrovich Maksimov, p. 269

Introduction
Small Houses: Their Economic Design and Construction (1922)

Report on the establishment of the Smithsonian Institution (c. 1846)

This Business of Living (1935-1950)