“Hear,” he answered: “the Son of God is not in the form of a slave, but in great power and might.” “How so, sir?” I said; “I do not understand.” “Because,” he answered, “God planted the vineyard, that is to say, He created the people, and gave them to His Son; and the Son appointed His angels over them to keep them; and He Himself purged away their sins, having suffered many trials and undergone many labours, for no one is able to dig without labour and toil. He Himself, then, having purged away the sins of the people, showed them the paths of life by giving them the law which He received from His Father. [You see,” he said, “that He is the Lord of the people, having received all authority from His Father.] And why the Lord took His Son as councillor, and the glorious angels, regarding the heirship of the slave, listen.
The holy, pre-existent Spirit, that created every creature, God made to dwell in flesh, which He chose. This flesh, accordingly, in which the Holy Spirit dwelt, was nobly subject to that Spirit, walking religiously and chastely, in no respect defiling the Spirit; and accordingly, after living excellently and purely, and after labouring and co-operating with the Spirit, and having in everything acted vigorously and courageously along with the Holy Spirit, He assumed it as a partner with it.
For this conduct of the flesh pleased Him, because it was not defiled on the earth while having the Holy Spirit. He took, therefore, as fellow-councillors His Son and the glorious angels, in order that this flesh, which had been subject to the body without a fault, might have some place of tabernacle, and that it might not appear that the reward [of its servitude had been lost], for the flesh that has been found without spot or defilement, in which the Holy Spirit dwelt, [will receive a reward]. You have now the explanation of this parable also.”
Source: The Pastor (or "The Shepherd") (New Advent)