Hereupon Trypho, after I had spoken these words, said, “Do not now suppose that I am endeavoring, by asking what I do ask, to overturn the statements you have made; but I wish to receive information respecting those very points about which I now inquire. Tell me, then, how, when the Scripture asserts by Isaiah, ‘There shall come forth a rod from the root of Jesse; and a flower shall grow up from the root of Jesse; and the Spirit of God shall rest upon Him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and piety: and the spirit of the fear of the Lord shall fill Him:’ (now you admitted to me,” continued he, “that this referred to Christ, and you maintain Him to be pre-existent God, and having become incarnate by God’s will, to be born man by the Virgin:) how He can be demonstrated to have been pre-existent, who is filled with the powers of the Holy Ghost, which the Scripture by Isaiah enumerates, as if He were in lack of them?”
Justin Martyr
Dialogue with Trypho
Chapter LXXXVII