5 But when the Lord proceeded to say, “Not as the world gives, give I unto you,” what else does He mean but, Not as those give who love the world, give I unto you? For their aim in giving themselves peace is that, exempt from the annoyance of lawsuits and wars, they may find enjoyment, not in God, but in the friendship of the world; and although they give the righteous peace, in ceasing to persecute them, there can be no true peace where there is no real harmony, because their hearts are at variance. For as one is called a consort who unites his lot (sortem) with another, so may he be termed concordant whose heart has entered into a similar union. Let us, therefore, beloved, with whom Christ leaves peace, and to whom He gives His own peace, not after the world's way, but in a way worthy of Him by whom the world was made, that we should be of one heart with Himself, having our hearts run into one, that this one heart, set on that which is above, may escape the corruption of the earth.
Source: Tractates on the Gospel of John (New Advent)