The world's oldest profession is neither prostitution nor politics. The oldest profession is shamanism - the shaman's job is to remove our consciousness from our body so we can rise above it, giving us the ability to look back on it and see what we are. Then we can be reintroduced to the self with new knowledge and an expanded range of consciousness.
What we have in Man's Guide to Psychology is the first fully-integrated approach to shamanism. It's taken 40,000 years, but here it is.