"The junior may not sit down until the senior says: Be seated!" ~~ Talmud Yerushalmi, Ketubot
"Too honor an old man one should not sit in his place or contradict his words." ~~ Rashi
"Be not boastful in your speech! " ~~ Ben Sira 4:32
"There is no truer index to intelligence than the way one acts at the table." ~~ Ibn Gabirol
"Insulting one’s senior is not the same as insulting one’s junior." ~~ Talmud, Ketubot
"Good manners may in Seven Words be found: Forget Yourself and think of Those Around." ~~ Arthur Guiterman
"Talk not while you eat, lest windpipe anticipate gullet (and life be in danger)!" ~~ Talmud, Ta’anit
"Manners provide the lubrication without which frictions would develop." ~~ Rabbi Edgar Magnin
"Shame not the old: we shall all be numbered among them." ~~ Ben Sira 8:6
"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