But besides, the prophecies which he introduces into his argument are very different from what the prophets actually foretold of Jesus Christ. For the prophecies do not foretell that God will be crucified, when they say of Him who should suffer, “We beheld Him, and He had no form or comeliness; but His form was dishonoured and marred more than the sons of men; He was a man of sorrows, and acquainted with grief.” Observe, then, how distinctly they say that it was a man who should endure these human sufferings.
And Jesus Himself, who knew perfectly that one who was to die must be a man, said to His accusers: “But now you seek to kill Me, a man that has spoken unto you the truth which I heard of God.” And if in that man as He appeared among men there was something divine, namely the only-begotten Son of God, the first-born of all creation, one who said of Himself, “I am the truth,” “I am the life,” “I am the door,” “I am the way,” “I am the living bread which came down from heaven,” of this Being and His nature we must judge and reason in a way quite different from that in which we judge of the man who was seen in Jesus Christ.
Accordingly, you will find no Christian, however simple he may be, and however little versed in critical studies, who would say that He who died was “the truth,” “the life,” “the way,” “the living bread which came down from heaven,” “the resurrection;” for it was He who appeared to us in the form of the man Jesus, who taught us, saying, “I am the resurrection.” There is no one among us, I say, so extravagant as to affirm “the Life died,” “the Resurrection died.” The supposition of Celsus would have some foundation if we were to say that it had been foretold by the prophets that death would befall God the Word, the Truth, the Life, the Resurrection, or any other name which is assumed by the Son of God.
Source: Against Celsus (New Advent)