Against Celsus 1.44

And I say this to the Jew not as a Christian who disbelieves Ezekiel and Isaiah, but to put him to shame on the basis of what we both believe: that this man is far more worthy than they to be believed when he says he saw such things and, as is likely, handed on to his disciples the vision he saw and the voice he heard. Another might say that not all who recorded the form of the dove and the voice from heaven heard Jesus telling of these things; but the Spirit that taught Moses the history older than himself, beginning from the making of the world and reaching to the time of Abraham his forefather, also taught those who wrote the Gospel the wonder that happened at the time of Jesus' baptism. And one who is adorned with the gift called "the word of wisdom" will also explain the reason for the opening of the heavens and for the form of the dove, and why the Holy Spirit appeared to Jesus in the form of this creature and not of some other. But the argument does not now require us to explain this; for our purpose is to show that Celsus did not soundly attribute to a Jew, with such words, disbelief in an event that, as is likely, happened—rather than in the things that the Jew himself believes.