"If you do a man a favor, do not regard it as a debt he must repay!" ~~ Mishle Shua’lim
"It is follly to listen at the door, and the clever man regards this as a very shameful thing." ~~ Ben Sira 21:24
"The Torah teaches incidentally good manners." ~~ Ishmael b. Elisha
"You shall rise before the aged and show deference to the old." ~~ Leviticus (Vayikra) 19:32
"Never enter a neighbor’s house unwarned." ~~ Derekh Eretz R.
"Who eats even plain bread and salt with his friend should be grateful to him." ~~ Tanna Deve Eliyahu R.
"Interrupt not the speech of your friend before he finish!" ~~ Hidden Scrolls
"In the midst of a discourse, speak not." ~~ Apocrypha: Ben Sira
"My son, answer not before you hear, nor speak in the midst of converse!" ~~ Ben Sira 11:8
"The test of good manners: to bear patiently with bad ones." ~~ Ibn Gabirol
"Who welcomes his friend with a smile is as one giving him the finest gifts in the world." ~~ Avot Derabbi Nathan
"Too honor an old man one should not sit in his place or contradict his words." ~~ Rashi