With the emergence of social groupings, individual irritations began to be submerged in the group feelings, and this promoted intratribal tranquillity but at the expense of intertribal peace. Peace was thus first enjoyed by the in-group, or tribe, who always disliked and hated the out-group, foreigners. Early man regarded it a virtue to shed alien blood.
Close in meaning, found by a language model. A match does not mean the teachings are the same.
What peace is there between a hyena and a dog? What peace is there between a rich man and the poor?
Brotherly love being thus sympathetically constituted, the seven kindred had a more sympathetic mutual harmony. For being educated in the same law, and practicing the same virtues, and reared up in a just course of life, they increased this harmony with each other. For the same ardor for what is right and honorable increased their goodwill and harmony toward each other. For it acting along with religion, made their brotherly feeling more desirable to them. And yet, although nature, companionship, and virtuous morals increased their brotherly love, those who were left endured to see their kindred, who were mistreated for their religion, tortured even to death.
The strife of the proud leads to bloodshed. Their abuse of each other is a grievous thing to hear.