George Eldon Ladd was an outstanding biblical theologian of the latter half of the 20th century. In his landmark work, A Theology of the New Testament, he brilliantly articulated a comprehensive theology of the Kingdom of God.
Simply stated, the Kingdom of God in the Bible is the reign and rule of God over all, which includes both the natural and the supernatural realms. Jesus himself came proclaiming the “gospel of the Kingdom” and demonstrated in every aspect of his life and ministry the in-breaking of that Kingdom particularly as it relates to the universe in which we live. The primary message of Jesus was the Kingdom had come, he was King of the Kingdom, and that his rule had broken afresh and authoritatively into human history. It’s a message that is reaffirmed throughout the New Testament as Hebrews 6:5 describes those who “have tasted the goodness of the word of God and the powers of the age to come.”