Quotes about habit
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First Week, Second Day. Compare: "Report of fashions in proud Italy, Whose manners still our apish nation Limps after in base imitation", William Shakespeare, Richard II, act ii. sc. 1.
La Semaine; ou, Création du monde (1578)

Introduction
Pioneers of France in the New World (1865)
“William Carlos Williams”, p. 216
Poetry and the Age (1953)

Introduction to his book The House of Lords in the Middle Ages (Weidenfeld & Nicolson, 1968), p. xi
1960s

Letter to Robert Bridges (15 February 1879)
Letters, etc

Thomas Henry Huxley. "Lectures on Evolution Title: This is Essay# 3 from" Science and Hebrew Tradition." (1882); as cited in: William Trufant Foster, (1908) Argumentation and debating, p. 55
1880s

10
Essays, Can Poetry Matter? (1991), The Catholic Writer Today (2013)

Book IV, Note VIII, p. 60
Les confidences (1849)

1920s, The Reign of Law (1925)

June 26 http://usinfo.state.gov/dhr/Archive/2005/Jun/27-499670.html
2000s, 2005

Higgins, The Celtic Druids. (quoted in Niranjan Shah, India: The Birthplace of Human Speech, International Vedic Vision, Sands Point, N.Y., 2013, p. 66. Quoted from Stephen Knapp, Mysteries of the Ancient Vedic Empire https://stephenknapp.wordpress.com/2015/10/30/a-look-at-india-from-the-views-of-other-scholars/

From Bauhaus to Koolhaas Interview in Wired magazine http://www.wired.com/wired/archive/4.07/koolhaas.html (4 July 1996)

But you probably will feel more energy, and enjoy a longer and healthier life.
Source: Mad Cowboy (1998), Ch. 2: The Simple Facts, pp. 40-41

“Habit is a cable; we weave a thread of it each day, and at last we cannot break it.”
As quoted in Graded Selections for Memorizing : Adapted for Use at Home and in School (1880) by John Bradley Peaslee, p. 104

talking about Guerilla Communication strategies in "Urban Hacking" http://www.transcript-verlag.de/ts1536/ts1536.php, transkript, p. 98
Charles Eisenstein, Oral presentation in Baltimore, MD March 2012

The American Credo: A Contribution toward the Interpretation of the National Mind (1920)
1920s
Source: Lectures on Teaching, (1906), pp. 292-293.

Possibly a misattribution, ascribed to Reade in Notes and Queries (9th Series) vol. 12, 17 October 1903. It appears (as an un-sourced quotation) in Life and Labor (1887) by Samuel Smiles and in the front of The Power of Womanhood by Ellice Hopkins (1899) htm http://www.gutenberg.org/files/13722/13722-h/13722-h..
Apparently a common saying in 19th century. It has been also attributed to an “old Chinese proverb”, Ralph Waldo Emerson (1803-1882), William Makepeace Thackeray (1811–1863), George Dana Boardman (1828-1903), Frances Elizabeth Caroline Willard (1839-1898), James Allen (1864-1912), Marcus Fabius Quintilianus http://en.wikipedia.org/wiki/Quintilian http://www.worldofquotes.com/author/Quintilian-(Marcus-Fabius-Quintilian)/1/index.html and William James.
No original source has ever been isolated. Its structure strongly reflects that of a ""classical Chinese"" set of aphorisms; and it may have been deliberately constructed in that form, by a non-Chinese, to imply an oriental (and, perhaps, far wiser) origin.
Finally, almost all of those who cite the complete piece:
::We sow a thought and reap an act;
::We sow an act and reap a habit;
::We sow a habit and reap a character;
::We sow a character and reap a destiny.
state that, in their view, it was written to expand an embellish the notion that was expressed at Proverbs XXIII:7 (""For as he thinketh in his heart, so is he"").
Attributed
Source: The Passionate Life (1983), p. 137
Source: The Bourgeois: Catholicism vs. Capitalism in Eighteenth-Century France (1927), pp. 121-122

Robert Shiller. Chalk Talk - Covariance, Financial Markets (Coursera) https://www.coursera.org/learn/financial-markets-global/lecture/41Ujc/chalk-talk-covariance.
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 340.

[Shermer, Michael, July, 2008, http://www.sciam.com/article.cfm?id=how-anecdotal-evidence-can-undermine-scientific-results, How Anecdotal Evidence Can Undermine Scientific Results, Scientific American, 2008-07-24]

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter I "The Origin of the Dwelling House" Sec. 1
Hamilton, Walton H. (1932), " Institution http://www.cos.ufrj.br/~mvbsoares/ecoinst/artigos/Hamilton_Institution.pdf," in Edwin R. A. Seligman and Alvin Johnson (eds), Encyclopaedia of the Social Sciences, Vol. VIII, New York: Macmillan, pp. 84–89.
Hansard, House of Commons, 6th series, vol. 89, col. 1157.
Speech on the Westland affair, 15 January 1986.

Robert Chambers, Chambers's Information for the People (1875) Vol. 2 https://books.google.com/books?id=vNpTAAAAYAAJ

Speech in Lyons (12 February 1971), from The Common Market: The Case Against (Elliot Right Way Books, 1971), pp. 68-69.
1970s

Speech delivered at Scottish Church College, Kolkata on 7th December 1935.

Source: An Essay on Aristocratic Radicalism (1889), p. 26

Source: Quotes of Salvador Dali, 1961 - 1970, Diary of a Genius (1964), p. 2

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 536.

pg. 14
The Sports and Pastimes of the People of England (1801), Hunting
Source: The Romantic Rebellion (1973), Ch. 6: Blake

Source: (1776), Book I, Chapter VIII, p. 86.

" The Death of Privacy and Why We Should Welcome It http://liftconference.com/death-privacy-and-why-we-should-welcome-it," January 18, 2009. (Remarks made during the Lift Conference)
"Aunt Jean's Marshmallow Fudge Diet"
Please Don't Eat the Daisies (1957)

Foreward, to "Memorial issue for Robert H. Jackson", 55 Columbia Law Review (April, 1955) p. 436; quoted by United States Senator Howell Heflin during the confirmation debate for Justice David Souter, on September 24, 1990, S13540.
Other writings

Nielsen v. Wait (1885), L. R. 16 Q. B. 71.

¶ 14
State Socialism and Anarchism: How Far They Agree, and Wherin They Differ (1888)

Cited in Socialist Internationalism: Theory and Practice of International Relations of A New Type http://leninist.biz/en/1982/SI507/4.2-Nationalism.in.the.Socialist.Countries
Special Relationship. p. 194.
The Light's On At Signpost (2002)

Goel, Sita Ram (2001). The story of Islamic imperialism in India. ISBN 9788185990231 Ch. 7.
Quotes from late medieval histories, 1660s

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 57.

“For the habit of arguing in support of atheism, whether it be done from conviction or in pretence, is a wicked and impious practice.”
Mala enim et impia consuetudo est contra deos disputandi, sive ex animo id fit sive simulate.
Book II, section 67
De Natura Deorum – On the Nature of the Gods (45 BC)

As quoted in The School as a Home for the Mind : Creating Mindful Curriculum, Instruction, and Dialogue (2007) by Arthur L. Costa, p. 91
Source: The Interpretation of Cultures (1973), p. 44

Source: Soldiers Live (2000), Chapter 33, “Khatovar: Leave-taking” (p. 488)

Ciò che più importa è che il popolo, gli uomini tutti, perdano gli istinti e le abitudini pecorili che la millenaria schiavitù ha loro ispirato ed apprendano a pensare ed agire liberamente.
Scritti: "Pensiero e volontá," rivista quindicinale di studi sociali e di coltura generale (Roma, 1924-1926) e ultimi scritti (1926-1932) [Writings: "Thought and Will," fortnightly magazine of social studies and culture general (Rome, 1924-1926) and later writings (1926-1932)], Vol. 3, p. 317; this is also quoted in the message on an Anarchist white stone monument in Pozzuoli, Italy, with simply "Gli anarchici" [The anarchists] appended to the statement.

“I know I began as a passion and have ended as a habit, like all husbands.”
The Simpleton of the Unexpected Isles, Act 2 (1934)
1940s and later

Source: 1960s, Hot & Cool (1967), p. 261

Creation seminars (2003-2005), The Garden of Eden

On Indira Gandhi
Khushwant Singh in Sikh Philosophy Network
Source: Masters of the Maze (1965), Chapter 7 (p. 85)
Source: Experiments in industrial organization (1912), p. 2; Cited in: Felix Behling et al. (2015; 194)
Pgs 268-269
The Menace of the Herd (1943)
"What is 'The Fittest'?" http://books.google.com/books?id=NzNpn-cojqYC&q=%22We+are+just+beginning+to+learn+that+our+same+old+habits+like+the+exploitation+of+nonrenewable+resources+may+make+us+at+one+with+the+auk+and+the+dodo%22&pg=PA118#v=onepage, syndicated (3 September 1980) http://news.google.com/newspapers?id=Kf8cAAAAIBAJ&sjid=so4EAAAAIBAJ&pg=2474,200754
Pieces of Eight (1982)

“Marriage is fine as an institution, but bad as a habit”
Interview in Motion Picture (October 1921) "Six Interviews with Buster Keaton" http://www.silentera.com/taylorology/issues/Taylor68.txt

[Human gullibility beyond belief,— the “paranormal” in the media, The Sunday Times, 1996-08-25]

The Education of Henry Adams (1907)

Source: The Cotton Manufacture of Great Britain, 1836, p. 234
Source: How Europe Underdeveloped Africa (1972), p. 385

On Democracy (6 October 1884)

Zhang, Xinjiang Fengbao Qishinian [Xinjiang in Tumult for Seventy Years], 3393-4.

The Education of Henry Adams (1907)

March 28, 1776, p. 296
Life of Samuel Johnson (1791), Vol III

Original Philosophy of Hypnotism The International College of Hypnosis & Hypnotherapy
As quoted in Thinking to Some Purpose (1939), p. 63