„More people are flattered into virtue than bullied out of vice.“

As quoted in Thesaurus of Epigrams: A New Classified Collection of Witty Remarks, Bon Mots and Toasts (1942) by Edmund Fuller

Romancing Opiates: Pharmacological Lies and the Addiction Bureaucracy (2006)

The Novel: What It Is (1893)

Page 32.
Golden Booklet of the True Christian Life (1551)

as quoted in The Bourgeois: Catholicism vs. Capitalism in Eighteenth-Century France (1927), p. 137

Origine: Instructions to his Son and to Posterity (published 1632), Chapter III
Contesto: Take care that thou be not made a fool by flatterers, for even the wisest men are abused by these. Know, therefore, that flatterers are the worst kind of traitors; for they will strengthen thy imperfections, encourage thee in all evils, correct thee in nothing; but so shadow and paint all thy vices and follies, as thou shalt never, by their will, discern evil from good, or vice from virtue. And, because all men are apt to flatter themselves, to entertain the additions of other men's praises is most perilous. Do not therefore praise thyself, except thou wilt be counted a vain-glorious fool; neither take delight in the praises of other men, except thou deserve it, and receive it from such as are worthy and honest, and will withal warn thee of thy faults; for flatterers have never any virtue — they are ever base, creeping, cowardly persons. A flatterer is said to be a beast that biteth smiling: it is said by Isaiah in this manner — "My people, they that praise thee, seduce thee, and disorder the paths of thy feet;" and David desired God to cut out the tongue of a flatterer.
But it is hard to know them from friends, they are so obsequious and full of protestations; for as a wolf resembles a dog, so doth a flatterer a friend. A flatterer is compared to an ape, who, because she cannot defend the house like a dog, labour as an ox, or bear burdens as a horse, doth therefore yet play tricks and provoke laughter. Thou mayest be sure, that he that will in private tell thee thy faults is thy friend; for he adventures thy mislike, and doth hazard thy hatred; for there are few men that can endure it, every man for the most part delighting in self-praise, which is one of the most universal follies which bewitcheth mankind.

Nahj al-Balagha

Part IV, Ch. 2
Religion and the Rise of Capitalism (1926)

According to The Inner Life of Abraham Lincoln (1867) by F. B. Carpenter, Lincoln quoted this as having been said to him by a fellow-passenger in a stagecoach. See also "Washington during the War", Macmillan's Magazine 6:24 http://books.google.com/books?id=rB4AAAAAYAAJ&pg=PA24&dq=folks (May 1862)
Posthumous attributions
Variante: It's my experience that folks who have no vices have generally very few virtues.

Tulsidas in "A Garden of Deeds: Ramacharitmanas, a Message of Human Ethics", p. 37

Page 40
Memoirs of a Woman of Pleasure

(Autumn 1792) [Source: Oeuvres Complètes de Saint-Just, vol. 1 (2 vols., Paris, 1908), p. 380]

Origine: A History of European Morals from Augustus to Charlemagne (1869), Chapter 5 (3rd edition p. 303)

Vice and Virtue, ii
The Note-Books of Samuel Butler (1912), Part II - Elementary Morality

Circles
Bartlett's Familiar Quotations, 10th ed. (1919)

Epode, lines 1-4
The Works of Ben Jonson, First Folio (1616), The Forest

Wives and Daughters, ch. 50 (1864-5)
Wives and Daughters