Geerhardus Vos devotes this work to a discussion of Jesus' greatest focus in ministry -- the "kingdom of God" (and the "kingdom of heaven," which Vos takes to be referencing the same thing.) Vos begins by connecting Christ's teaching on the kingdom to the Old Testament and its concepts of a Messianic king. Then he moves into the conception of the kingdom during the New Testament with a cursory analysis of the pertinent Greek phrases (but largely accessible...