To test their degree of presence, some Zen masters have been known to creep up on their students from behind and suddenly hit them with a stick. Quite a shock! If the student had been fully present and in a state of alertness, if he had “kept his loin girded and his lamp burning,” which is one of the analogies that Jesus uses for presence, he would have noticed the master coming up from behind and stopped him or stepped aside. But if he were hit, that would mean he was immersed in thought, which is to say absent, unconscious.
– Eckhart Tolle, The Power of Now