In a certain fashion our word becomes a bodily sound by assuming that in which it is manifested to the senses of men, just as the Word of God became flesh by assuming that in which it too could be manifested to the senses of men. And just as our word becomes sound without being changed into sound, so the Word of God became flesh, but it is unthinkable that it should have been changed into flesh. It is by assuming it, not by being consumed into it, that both our word becomes sound and that Word became flesh.
Augustine, The Trinity, 15.20. Quoted in Bradley G. Green, The Gospel and the Mind (Crossway, 2010), 135-136.