...although in truth they have no form or appearance. This is clear in the light of what we have explained above. It is just that they appear in some form or likeness. What this means is that prophetic likenesses and images are not mere metaphors and allusions: this is the way the prophet actually sees what he sees. What we say about the Partzufim is actually the way they are seen in the Chariot.
But one who examines them will see that in truth, the form and likeness are purely contingent upon the observer. This principle is expressed in the verse, “To whom then will you liken Me that I should be equal? says the Holy One” (Isaiah 40:25). What this means is that the prophets are not left with the illusion that this is the way it actually is, God forbid. As I have already said, the prophet sees the vision, likeness or image and understands the hidden level. When he attains his prophecy, he sees clearly that the picture in his vision is a likeness contingent upon the observer and not an integral aspect of the essence of that which is observed. The prophet himself understands this at the very time of the prophetic vision, as it says: “To whom, then, will you liken God and what likeness will you compare to Him?” (Isaiah 40:18).