And again: “I will put My trust in Him.” By this he also shows that He became man and our brother. For as each human being trusts in Him, that is, in the Father, so does He Himself.
At the same time He shows us that we must hope in God alone. For He Himself, being the Son and lacking nothing, nevertheless says that He trusts in the Father.
Some have interpreted it thus. Since, they say, above he called Christ brother, and below Father, in the middle he shows that these names belong to the divine economy of the last times. His eternal name is God.
Who, properly speaking, hopes in another, if not in God? It is as though he said: When you hear that He is brother and father, do not think that He is one among many. He is God, he says, and in Him, as Scripture testifies, one must hope.
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Thus the words here are not spoken in the person of Christ, but by the prophet, who says: I, the prophet, will hope in Christ Himself as God. Yet this understanding is not complete.
And again: “Behold, I and the children whom God has given Me” (Is 8:18). Here he calls Christ our Father. “Given” means the Father’s good pleasure that He should be incarnate. If He had not been pleased that the Son be incarnate, then He would have had no children.