The Way

Also known as the Path.
For now, we draw the attention of the reader particularly to the first clue, the most important for him: the way is a one-way street. Meaning that whoever begins to walk it is forbidden to turn back. This is not because of some kind of external imperative, but due to the fact that each step forward on the Way irrevocably modifies the content of whoever has started walking it. It follows that he will become more and more of a stranger to his surroundings; that he will lose more and more interest in exterior life, in which only yesterday he participated fully. The appearance of things, and especially of beings, undergoes a deep change in his eyes. He will one day be surprised to constate that certain faces which only yesterday he found very beautiful now reveal to him marks of bestiality behind their features: not all, but many of them!
Here is referenced e.g. the Seeing of the Beast.