Sentence:  "Whether it's logic, meditation, channeling, <WSD>astral projection</WSD> or ghosts, all are ways of knowing," he wrote. 
Meaning of the word marked with <WSD> tags:  The ability to deliberately detach one's mind, or a ghost-like replica of one's body (one's astral body), from one's physical body and to send it to distant places or into alternate realities or into people's dreams.