The three senses in which we can understand the Kingdom in the Bible
The term "Kingdom" itself denotes itself in three main senses. First, the "Kingdom" refers to the realm and reign of God over the earth currently and from eternity (Psalm 22:28; 45:6). Second, the kingdom of God is promised to manifest itself fully on the earth (Ezekiel 40-48; 1 Corinthians 15:20-28). These first two senses speak respectively of a "past, eternal, invisible reign of God" and a "future, visible reign of God". This at least summarizes the Old Testament Jewish understanding of God's Kingdom. The third sense of which the Kingdom is spoken of in the Bible is the idea of an "already/not yet" phase of which Jesus introduces in His ministry and which is unfolded more below.