Augustine of Hippo
Catena Aurea · Johannesevangelium 17
I have manifested thy name unto the men which thou gavest me out of the world: thine they were, and thou gavest them me; and they have kept thy word. Now they have known that all things whatsoever thou hast given me are of thee. For I have given unto them the words which thou gavest me: and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me.
(Tr. cvi) Which Thou hast given Me out of the world: i. e. who were not of the world. But this they were by regeneration, not by nature. What is meant by, Thine they were, and Thou gavest them Me? Had ever the Father any thing without the Son? God forbid. But the Son of God had that sometimes, which He had not as Son of man; for He had the universe with His Father, while He was still in His mother’swomb. Wherefore by saying, They were Thine, the Son of God does not separate Himself from the Father; but only attributes all His power to Him, from whom He is, and hath the same. And Thou gavest them Me, then, means that He had received as man the power to have them; nay, that He Himself had given them to Himself, i. e. Christ as God with the Father, to Christ as man not with the Father. His purpose here is to shew His unanimity with the Father, and how that it was the Father’s pleasure that they should believe in Him.