The man, together with the angel, walked for a while. After that, the man turned to the angel, said: "Now I have to agree that angels exist. But you are not physical, similar to human beings." "What do you mean?" said the angel. And the man replied: "We came to a big rock. I had to walk a different path, but I saw you walk through it. We came to a big log that had fallen into the road. I had to crawl over it, but you walked through it." This answer confused the angel. The angel said: "Did you too see that we walked on a marsh? Then both you and I could walk through the fog. That was because we were much harder than the fog."
