If you ever wanted to know more about occultism, and higher worlds, etheric body, astral body, and so on and so forth ... you may want to read the various work of Rudolf Steiner.
Here's a few selected books and topics covered
PHILOSOPHY OF FREEDOM Steiner's most Important philosophical work deals both with epistemology, the study of how man knows himself and the world, and with the issue of human freedom.
In the first half of the book Steiner focuses on the activity of thinking in order to demonstrate the true nature of knowledge. There he shows the fallacy of the contemporary idea of thinking, pointing out that the prevailing belief in the limits to knowledge is a self-imposed limit that contradicts its own claim to truth.
The possibility for freedom is taken up in the second half of the book. The Issue is not political freedom, but something more subtle; freedom of the will. There are those who maintain that man's thoughts and actions are Just as determined as a chemical reaction or a honey bee's behavior. Steiner points again to the activity of thinking, from which arises the possibility of free human action.
OCCULT SCIENCE, AN OUTLINE This work of nearly 400 pages begins with a thorough discussion and definition of the term “occult” science. A description of the super sensible nature of man follows, along with a discussion of dreams, sleep, death, life between death and rebirth, and reincarnation. In the fourth chapter evolution is described from the perspective of initiation science. The fifth chapter characterizes the training a student must undertake to become an initiate. The sixth and seventh chapters consider the future evolution of the world and more detailed observations regarding super sensible realities.
source : www.rsarchive.org/Basics/
