It's just that he is about to do something out of the ordinary. And after he does something like that, the everyday look of things will surely change just a little. Things will look different than they did before, yet somehow still be faintly familiar. But he knows he shouldn't let appearances fool him. There's always only one reality - one truth - one perception. For the man who comes back through the crack in the veil will never be quite the same as the man who simply went out. He will be wiser but less sure, happier but less self-satisfied, humbler in acknowledging his ignorance yet better equipped to understand the relationship of words to things, of systematic reasoning to the unfathomable mystery which he tries, forever vainly, to comprehend.
