5. Hatred never ends through hatred; by non-hatred alone does it end. This is an eternal law in this world”
6. “The people who quarrel do not realize that one day through these quarrels they will die, but those who do realize this fact settle their quarrels”
Dhammapada 5 & 6
Read all the verses in the chapter of Pairs on SuttaFriends.org in Pali and English.