"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
"All men should rise when a sage passes." ~~ Talmud, Kiddushin 33a
"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
"Without manners no Torah, without Torah no manners." ~~ Eleazar b. Azariah, Mishna: Avot
"Good manners is thoughtfulness of God and of men." ~~ Jehiel Anav