Source: The Purpose and Power of Love & Marriage
“Campaign promises are, by long democratic tradition, the least binding form of human commitment.”
On campaign promises: Republican Party v. White, 536 U.S. 765 http://supct.law.cornell.edu/supct/html/01-521.ZO.html (2002) (majority opinion).
2000s
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Antonin Scalia 100
former Associate Justice of the Supreme Court of the United… 1936–2016Related quotes

Reaction to the Coalition's budget http://www.publications.parliament.uk/pa/cm201011/cmhansrd/cm100622/debtext/100622-0007.htm#10062245000003, 22 June, 2010. Link to the video http://www.youtube.com/watch?v=5vdzUJMcDpA&feature=related

“A promise is binding in the inverse ratio of the numbers to whom it is made.”
Appendix.
Confessions of an English Opium-Eater (1822-1856)

Internet Encyclopedia of Philosophy

“Republicans campaign like Libertarians and govern like Democrats.”
Source: Liberty A to Z (2004), p. 151
“But the form of free verse is as binding and as liberating as the form of a rondeau.”
From his essay 'Goatfoot, Milktongue, Twinbird' in the book of the same title. 1978. ISBN 0-472-40000-2.

Source: See The Jews https://books.google.com.br/books?id=t_RtAAAAMAAJ by Zuhdī Fātiḥ

“Commitment is what transforms a promise into reality.”

Eastern View of Economics http://web.archive.org/web/20150906075839/http://www.religion-online.org/showarticle.asp?title=3607

Words of Sarvepalli Radhakrishnan, quoted by Haile Selassie in an address http://www.jah-rastafari.com/selassie-words/show-jah-word.asp?word_id=radhakrishan during the Indian President's state visit to Ethiopia (13 October 1965), quoted in Foreign Affairs Record Vol. 11-12 (1965-1966) by India Ministry of External Affairs, p. 266; Radhakrishnan is also quoted as having made these remarks in The Visva-Bharati Quarterly Vol. 5 (1939-1940)