Life is a struggle to win against evil, both within and without. “Do not be overcome by evil, but overcome evil with good” Rom 12.21.
Without lowliness of heart there will only be loneliness in relationships, for selfishness shuts down the capacity to relate. Humility opens the door to meaningful interactions.
In personal relationships, saints forgo vengeance. This is clear in Jesus’ words and in all the Bible. “… whoever strikes you on the right cheek, turn the other to him as well” Mt 5.39.