Cyprian of Carthage

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(ubi sup.) The kingdom of God may stand for Christ Himself, whom we day by day wish to come, and for whose advent we pray that it may be quickly manifested to us. As He is our resurrection, because in Him we rise again, so may He be called the kingdom of God, because we are to reign in Him. Rightly we ask for God’s kingdom, that is, for the heavenly, because there is a kingdom of this earth beside. He, however, who has renounced the world, is superior to its honours and to its kingdom; and hence he who dedicates himself to God and to Christ, longs not for the kingdom of earth, but for the kingdom of Heaven.