“…God commanded in the law [Deut. 22:22-24] that adulterers be stoned... The temporal sword and government should therefore still put adulterers to death... Where the government is negligent and lax, however, and fails to inflict the death penalty, the adulterer may betake himself to a far country and there remarry if he is unable to remain continent. But it would be better to put him to death, lest a bad example be set...”
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Martin Luther 214
seminal figure in Protestant Reformation 1483–1546Related quotes

1990
December
Ron Paul Political Report
8
http://www.tnr.com/sites/default/files/PR_Dec90_p8.pdf, quoted in * 2011-12-23
TNR Exclusive: A Collection of Ron Paul's Most Incendiary Newsletters
New Republic
http://www.tnr.com/article/politics/98883/ron-paul-incendiary-newsletters-exclusive
regarding Martin Luther King, Jr.
Disputed, Newsletters, Ron Paul Political Report

On being told his son had joined the Communist Party, as quoted in Try and Stop Me (1944) by Bennet Cerf
A statement similar in theme has also been attributed to Clemenceau:
A young man who isn't a socialist hasn't got a heart; an old man who is a socialist hasn't got a head.
As quoted in "Nice Guys Finish Seventh" : False Phrases, Spurious Sayings, and Familiar Misquotations (1992) by Ralph Keyes.
W. Gurney Benham in A Book of Quotations (1948) cites a statement by François Guizot as the earliest known expression of this general idea, stating that Clemenceau merely adapted the saying substituting socialiste for republicain:
N'être pas républicain à vingt ans est preuve d'un manque de cœur ; l'être après trente ans est preuve d'un manque de tête.
Not to be a republican at twenty is proof of want of heart; to be one at thirty is proof of want of head.
Variations on this general idea have also been attributed or misattributed to many others, most commonly Winston Churchill, who is not known to have actually made any similar statement.
Post-Prime Ministerial

Dissenting, Olmstead v. United States, 277 U.S. 438 (1928).
Judicial opinions

“One should hasten to put such witches to death.”
Statement of 20 August 1538; as quoted in Conversations With Martin Luther (1915), translated and edited by Preserved Smith and Herbert Percival Gallinger, p. 163

"Journal of Indian Council of Philosophical Research, Volume 19, Issue 1", p. 73

Diogenes Laërtius, vi. 44
Quoted by Diogenes Laërtius