The Incarnation is already the beginning of the coming of Christ's Kingdom, which includes, but is not ideentical with, the Kingdom of Heaven or of God. The preaching of the “Gospel of the Kingdom” therefore opens with the same good news announced by the Forerunner and by Christ: “the Kingdom of God is at hand.” The Kingdom of Heaven (= the Kingdom of God)
simultaneously has immanent, transcendent, and historical aspects.
In its immanent aspect, it is spiritual and religious;
it is the life in God: “Blessed are the poor in spirit: for theirs is the kingdom of heaven” (Mat.5:3). The Kingdom is taken “by force” (11:12), and its crowning is “righteousness, and peace, and joy in the Holy Spirit” (Rom.14:17).
In its transcendent aspect, the Kingdom of God arrives through God's action in the world and upon the world: “inherit the kingdom prepared for you from the foundation of the world” (Mat.25:34).
It also has a historical and apocalyptic aspect: It is the one-thousand-year reign of the saints with Christ, His coming in glory.