29 We can therefore no longer doubt that by the end is meant an ultimate and final condition and not a dissolution. We shall have something more to say upon this subject, when we come to the explanation of this passage, but for the present this is enough to make our meaning clear. Let us, therefore, turn now to the delivering of the Kingdom, and see whether it means a surrender of rule, whether the Son by delivering ceases to possess that which He delivers to the Father.
If this is what the wicked contend in their unreasoning infatuation, they must allow that the Father, by delivering, lost all, when He delivered all to the Son, if delivery implies the surrender of that which is delivered. For the Lord said, All things have been delivered unto Me of My Father, and again, All authority has been given unto Me in heaven and earth. If, therefore, to deliver is to yield possession, the Father no longer possessed that which He delivered.
But if the Father did not cease to possess that which He delivered, neither does the Son surrender that which He delivers. Therefore, if He did not lose by the delivering that which He delivered, we must recognise that only the Dispensation explains how the Father still possesses what He delivered, and the Son does not forfeit what He gave.
Source: On the Trinity (New Advent)