On the Third Eye

The influx of the Lord Himself into man is into his forehead, and from that into the whole face, because the forehead of man corresponds to love, and the face corresponds to all his interiors. The influx of spiritual angels into man is into his head every where, from the forehead and temples to the whole part that contains the cerebrum, because that region of the head corresponds to intelligence; but the influx of celestial angels is into that part of the head that contains the cerebellum, and is called the occiput, from the ears all around even to the neck, for that region corresponds to wisdom. All the speech of angels with man enters by these ways into his thought; and by this means I have perceived what angels they were that spoke with me. - Emanuel Swedenborg, Heaven and Hell 251

 There was a time when the etheric head protruded way beyond the physical body. Even in Atlantean times, the forehead was a point where the etheric head stood far out beyond the physical head, as is still the case today with the horses and other animals. With horses the etheric head today still protrudes beyond the physical. In modern man this point in the etheric head has been brought under protection of the physical head and this gives him the capacity to develop those parts of the physical brain which enable him to call himself “I.” This organ, which enables man to call himself “I,” is connected with a definite process which took place during the Atlantean development of the earth. The occult teacher now instructs his pupil thus: direct your thoughts and concentrate them on this point! Then he gives him a mantra. In this way, a certain force in this part of the head is aroused which corresponds to a certain process in the macrocosm. In such a way a correspondence between microcosm and macrocosm is evoked. Through a similar concentration on the eye, the pupil acquires knowledge of the sun. One finds the entire spiritual organization of the macrocosm spiritually within one's own organs. ... All around us are parts of our self. This is represented, for example, in the myth of Dionysos. It is for this reason that the Rosicrucian training places such a great value upon an objective and quiet contemplation of the external world: If you wish to know yourself, behold yourself in the mirror of the outer world and its beings! What is in your soul shall speak to you far more clearly from the eyes of companions than if you harden yourself and sink into your own soul.  - Rudolf Steiner, Esoteric Development