Augustine of Hippo

Therefore Christ will hand the kingdom over to God and the Father when through him the Father will be known by sight, for his kingdom consists of those in whom he now reigns through faith. In fact, in one sense Christ's kingdom means his divine power according to which every created thing is subject to him; and in another sense his kingdom means the church in respect to the faith that it has in him. In accord with this meaning is the prayer of him who says, "Possess us," for it is not the case that [Christ] himself does not possess all things. This is also the meaning of the following statement: "When you were the slaves of sin, you were free from righteousness." Therefore he will destroy every dominion and every authority and power, so that he who sees the Father through the Son will neither require nor be pleased with repose in his own or the power of any created thing.