The words in the title were used by Freud when he was talking to Jung about the possibility of doing work together. He was utterly opposed to even the discussion of the possibility of occult phenomena, and Jung, who was psychically very gifted, was not happy with Freud’s closed mind.
Nowadays there is a huge sub-culture in America that has experienced what are called occult phenomena. People in this group have practiced skills or activities that have brought them into contact with mental and physical phenomena unknown to those who have not done the practices.
They have practiced such skills as Hatha Yoga, Oriental martial arts, astrology, self-hypnosis, meditation, Reiki, Cranio-sacral therapy, acupuncture, meditation and other things. They are different from those people who have not done such things, and can often recognize other people who have done them by subtle clues imperceptible to those who haven’t.