When the Mentor is satisfied that the Candidate understands the social customs of the Oglala sufficiently well to know when a Shaman may, or may not, interfere with them, he should then instruct him relative to the doctrines and ceremonials pertaining to the Gods. Some of these are known to the people, but most of them are known only by the Shamans and they hide these in a ceremonial language known only by them. This language is made up of common words to which an esoteric meaning is given and of strange words that are known only by the Shamans. The sacred mysteries