Quotes about behavior
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“There is no way to hold your own in a relationship and simultaneously accept rude behavior.”
Source: Why Men Love Bitches: From Doormat to Dreamgirl—A Woman's Guide to Holding Her Own in a Relationship

“All human behavior has a reason. All behavior is solving a problem.”
Source: Disclosure

Source: An Unquiet Mind: A Memoir of Moods and Madness

Source: An Unquiet Mind: A Memoir of Moods and Madness
“I like maxims that don't encourage behavior modification.
-Calvin”
19 Jan 91
Attack of the Deranged Mutant Killer Monster Snow Goons
Source: The Complete Calvin and Hobbes

Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead

Attributed to Leary by Terence McKenna in one of his talks ( "The World and Its Double" https://terencemckenna.wikispaces.com/The+World+And+Its+Double, 11 September 1993, Nature Friends Lodge, Sierra Madre, CA), though he also stated[citation needed] Leary denied ever having said it.
Misattributed

“Our behavior is a function of our decisions, not our conditions.”
Source: The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change

Source: Influence: The Psychology of Persuasion

“Weird behavior is natural in smart children, like curiosity is to a kitten.”
Source: Kingdom of Fear: Loathsome Secrets of a Star-Crossed Child in the Final Days of the American Century
Source: Why Men Love Bitches: From Doormat to Dreamgirl—A Woman's Guide to Holding Her Own in a Relationship

“Or - perhaps - I should just worry about my own behavior and let others be who they are.”

Source: The Gifts of Imperfection: Let Go of Who You Think You're Supposed to Be and Embrace Who You Are

Presumably a paraphrase of "A peculiar virtue in wildlife ethics is that the hunter ordinarily has no gallery to applaud or disapprove of his conduct" or of "Hunting for sport is an improvement ..." above.
Unlikely to be by Leopold, who knew that ethics involves not only doing the right thing, but also determining the right thing in the face of competing desirable criteria.
Misattributed

“Human behavior is messy and unpredictable and unconcerned with convenient symmetries.”
Source: And the Mountains Echoed

“True repentance involves a change of heart and not just a change of behavior.”

Source: Walden and Other Writings

“What we all want, really, is to be loved. That craving drives our worst behavior.”
Source: Handle with Care

Source: 1960s-1970s, The Sciences of the Artificial, 1969, p. 53.

Source: The Tipping Point: How Little Things Can Make a Big Difference

Source: The Tipping Point: How Little Things Can Make a Big Difference
Source: Codependent No More: How to Stop Controlling Others and Start Caring for Yourself

“My hobby is extreme Catholic behavior -- BEFORE the Reformation.”

Source: Sexuality and the Psychology of Love
“If you can understand human behavior, it can’t hurt you nearly as much.”
Source: What Happened to Lani Garver

Speech delivered in Finney Chapel at Oberlin College (22 October 1964), as reported in "When MLK came to Oberlin" by Cindy Leise, The Chronicle-Telegram (21 January 2008)
Variant: It may be true that the law cannot make a man love me, but it can keep him from lynching me, and I think that's pretty important.
Wall Street Journal (13 November 1962), Notable & Quotable , p. 18
1960s
Context: It is true that behavior cannot be legislated, and legislation cannot make you love me, but legislation can restrain you from lynching me, and I think that is kind of important.

“The beauty myth is always actually prescribing behavior and not appearance.”
Source: Chapter 1 : 'The Beauty Myth', p. 14
Source: On the Bright Side, I'm Now the Girlfriend of a Sex God

“You cannot shame or belittle people into changing their behaviors.”
Source: The Hidden Messages in Water

“So I put up with bad behavior in the name of loving the way I thought you were supposed to love.”
Source: The Secret Life of Prince Charming
Source: A Kiss at Midnight

“Behavior is what a man does, not what he thinks, feels, or believes.”

Source: "Institutional Economics," 1931, p. 648

Entry (1956)
Eric Hoffer and the Art of the Notebook (2005)
Source: The American Business Cycle, 1986, p. 2

Herbert Gintis and Rakesh Khurana. " What Happened When Homo Economicus Entered Business School https://evonomics.com/what-happens-when-you-introduce-homo-economicus-into-business/," in: evonomics.com, July 14, 2016.
Miller (1956) "General behavior systems theory and summary". In: Journal of Counseling Psychology. 3 (2) 120-124. Cited in: Francis Ferguson (1975) Architecture, cities and the systems approach. p. 12
As cited in: D.C. (1969) "Systems Theory — A Discredited Philosophy". in: Abacus V. p. 4
1950s, Problems of Life (1952, 1960)
"In praise of counter-conduct," History of the Human Sciences, v. 24, n. 4
Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), p. 69

Source: Refactoring: Improving the Design of Existing Code, 1999, p. 33-43 as cited in: Militiadis Lytras, Patricia Ordóñez de Pablos, Ernesto Damiani (2011) Semantic Web Personalization and Context Awareness. p. 111

Grady Booch (2006) " On design https://www.ibm.com/developerworks/community/blogs/gradybooch/entry/on_design?lang=en" cited in: Frank Buschmann, Kevlin Henney, Douglas C. Schmidt (2007) Pattern-Oriented Software Architecture, On Patterns and Pattern Languages. p. 214
Source: Europe on the Move: War and Population Changes, 1917-1947, 1948, p. 3
"So Cleverly Kind an Animal", p. 267
Ever Since Darwin (1977)

Hillary Clinton (1975) State of Arkansas V. Thomas Alfred Taylor affidavit as quoted in Did Hillary Clinton betray a criminal client? http://www.cnn.com/2014/07/01/opinion/callan-hillary-clinton/ CNN (2014/07/01).
1970s

Kenneth Arrow, “The Organization of Economic Activity: Issues Pertinent to the Choice of Market versus Non-market Allocation” (1969)
1950s-1960s

Source: Lucy Aharish's campus speech http://www.onlife.co.il/%D7%A2%D7%91%D7%95%D7%93%D7%94/%D7%9E%D7%A0%D7%94%D7%99%D7%92%D7%95%D7%AA-%D7%94%D7%99%D7%95%D7%9D-%D7%90%D7%AA-%D7%94%D7%9E%D7%97%D7%A8/85312/%D7%9C%D7%95%D7%A1%D7%99-%D7%90%D7%94%D7%A8%D7%99%D7%A9-%D7%9C%D7%90-%D7%91%D7%90%D7%AA%D7%99-%D7%9C%D7%9E%D7%A6%D7%95%D7%90-%D7%97%D7%9F-%D7%91%D7%A2%D7%99%D7%A0%D7%99-%D7%90%D7%A3-%D7%90%D7%97%D7%93 at "מנהיגות היום את המחר". Onlife. 9 November 2014. Retrieved 27 January 2015. Video available.
(Civilization and Human Nature, p. 4).
Book Sources, The Wisdom of W.E.B. Du Bois (2003)
Source: "Influence, Power, Religion, and the Mechanisms of Social Control," 1999, p. 161