Kingdom of heaven (Greek: βασιλεία τῶν οὐρανῶν) is a phrase used in the Gospel of Matthew. It is generally seen as equivalent to the phrase "kingdom of God" (Greek: βασιλεία τοῦ θεοῦ) in the Gospel of Mark and the Gospel of Luke. Thought to be the main content of Jesus's preaching in the Gospel of Matthew, the "kingdom of heaven" described "a process, a course of events, whereby God begins to govern or to act as king or Lord, an action, therefore, by which God manifests his being-God in the world of men." See Kingdom of Heaven on Wikipedia