But while all have realised that it was a stable, not so many have realised that it was a cave. Some critics have even been so silly as to suppose that there was some contradiction between the stable and the cave; in which case they cannot know much about caves or stables in Palestine. As they see differences that are not there, it is needless to add that they do not see differences that are there. When a well-known critic says, for instance, that Christ being born in a rocky cavern is like Mithras having sprung alive out of a rock, it sounds like a parody upon comparative religion.