We may be able quite to comprehend that God can communicate immediately with man, for without the intervention of bodily means He communicates to our minds His essence; still, a man who can by pure intuition comprehend ideas which are neither contained in nor deducible from the foundations of our natural knowledge, must necessarily possess a mind far superior to those of his fellow men, nor do I believe that any have been so endowed save Christ. To Him the ordinances of God leading men to salvation were revealed directly without words or visions, so that God manifested Himself to the Apostles through the mind of Christ as He formerly did to Moses through the supernatural voice. In this sense the voice of Christ, like the voice which Moses heard, may be called the voice of God, and it may be said that the wisdom of God (i.e. wisdom more than human) took upon itself in Christ human nature, and that Christ was the way of salvation.
The answer is interesting, and I'll be saying something about it at some point in the future.