Objection: But Christ came to bring peace. We should work for peace.
Reply: He also said he came to bring a sword. He did not come to bring us the peace that the world gives. He explicitly said that. He clearly distinguished his peace from the world’s peace, just as he clearly distinguished his love from the world’s love, saying that by this all people would know and recognize and distinguish his disciples, by the new kind of love they had for each other. The peace that the world gives is saying yes to the world, the flesh and the devil. The peace Christ brought, the peace the world cannot give, is a peace with neighbor, with self and with God. This peace means making war on greed and lust and pride, which are the enemies of peace with neighbor, self and God. The two forms of peace are exact opposites. They are at war with each other. (Peter Kreeft, Reclaiming the Great Tradition)