To smite an Israelite is as if one smote the Shekinah.
~ Sanhedrin, 58
For every sin, a messenger is sent to punish, except the sin of abusing without cause, for which God Himself punishes.
~ Baba Metzia, 59
If thous sayest a minor word of abuse against another, consider it as if thous hads said a major word.
~ Derek Eretz Zuta, 1
Oftentimes a man praises his fellow in a low voice but derides him in a loud.
~ Sotah, 32
“And ye shall not wrong one another” (Lev. 25, 17). This injunction, repeated in verses 14 and 17 applies in one instance to money and in the other to words. How to words? If one is a penitent, say not: ” Remember thy previous deeds.” If one is the son of a proselyte, say not: “Remember thy father’s deeds.”
~ Sifra to Lev. 25,17
The Sages have told: Once at the close of Yom Kippur, all the people followed after the High Priest to escort him to his home. But when they observed Shemaiah and Abtalion, the left the High Priest and formed an escort for the Chief Justices. The latter, however escorted the Hight Priest to his home, for the sake of peace. The arrogant High Priest remarked to them: “May the sons of the Gentiles go in peace!” The Rabbis resented this reminder of their origin and declared: “May the sons of the Gentiles go in peace, for they imitate Aaron in seeking peace! But should the son of Aaron go in peace when he does not imitate his forefather in seeking peace?”
~ Yoma, 71
Master List of Great Quotes