Which textual evidence from the interlopers supports the conclusion that hatred feeds on itself

"The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way; as boys they had thirsted for one another's blood, as men each prayed that misfortune might fall on the other…" dunno if it is right

these have to be in your own words

the first, third, and last sentences are correct for plato.