Reputations are destroyed by malicious gossip. Greed puts enmity between rich and poor. Wars are fought over arrogant assertions. Humility as a virtue is a major theme of both the Old and New Testaments. It is because a demeanor of humility is exactly what is needed to live in peace and harmony with all persons.
Humility dissipates anger and heals old wounds.
Humility allows us to see the dignity and worth of all God's people. Humility distinguishes the wise leader from the arrogant power-seeker. Acting with humility does not in any way deny our own self worth. Rather, it affirms the inherent worth of all persons. Better is a dish of vegetables where love is, than a fattened ox and hatred with it.