When Jesus ascended into Heaven, He gave His disciples the mission of evangelization—the mission of building up the Kingdom of God among all the peoples of the world. This Kingdom, however, would not be like the other kingdoms of the world—which seek power and dominance—but would be a Kingdom of God’s mercy and salvation for the entire human family who toils under the burden of sin. The Church fulfills this mission by spreading the Gospel message and teaching the Christian way of life. Catholic Social Teaching plays an essential role in this work of evangelization, which is accomplished not through power and politics but through humble service to our fellow man.