"A man who does not want to buy should not say to a vendor: “How much does this thing cost?”" ~~ Derekh Eretz
"No learning, no manners; no manners, no learning; no lore, no loaf." ~~ Avot 3:17
"Some men are stupid: they stand up to honor a Holy Scroll, but do not rise to honor a sage." ~~ Talmud Makkot 22b
"Who guards his mouth preserves his life." ~~ Proverbs (Mishle) 13:3
"If a great man said it, do not laugh at it!" ~~ Talmud, Berakhot
"Good manners mean more than learning." ~~ Tanna Deve Eliyahu R.
"Who respects the elderly is as if he respects the Lord." ~~ Alphabet of Ben Sira
"A man without grace is as a tale out of season." ~~ Ben Sira 20:14
"Do not dishonor the old: we shall all be numbered among them." ~~ Ben Sira
"Your elder brother should be respected like your father." ~~ Yemenite Proverb
"Teach a child good manners during babyhood." ~~ Nachman of Bratslav
"Do not offer your food to one who has no appetite for it!" ~~ Mivchar Hapeninim