"A man without a wife has no defense against temptation." ~~ (adapted from) Talmud, Yebamot 63a
"Jealousy is the worst of evils, because it hurts first one’s friend. " ~~ Moshe Ben Ezra
"When sinning, the fool blames others, the moralist himself and the wise and righteous neither himself nor others." ~~ Mivchar Hapeninim
"If the evil inclination tells you: Sin and God will pardon!- – -believe it not!" ~~ Talmud, Chagigah
"Praising the wicked is wrong. " ~~ Talmud, Sota
"It is better that you should not vow than that you should vow and then not pay." ~~ Ecclesiastes (Kohelet) 5:4
"Crime is its own punishment. " ~~ Chaim of Valozhin
"Who consorts with the unclean becomes himself unclean; who consorts with clean is cleansed. " ~~ Kelim 12:12
"Who has not savored sin has not been qualified for saintliness. " ~~ Jacob Klatzkin
"A faultless man is possible only in a faultless world." ~~ Hasdai
"Who says, “I shall sin and repent, I shall sin and repent”, repentance will not be vouchsafed him." ~~ Talmud, Yoma
"May my death atone for all my sins!" ~~ Talmud, Berakhot