Extract taken from 'A Treatise On Cosmic Fire' by Alice A Bailey:
"First, through the direct impulse of the Ego on its own plane. During the greater part of evolution the Ego makes its contact with its reflection, physical plane man, through the center at the top of the head. When man is more highly evolved, and is nearing or treading the Path, the indwelling Self takes a more complete grasp of its lower vehicle, and descends to a point in the head or brain which is found approximately in the center of the forehead. This is its lowest contact. It is interesting here to note the correspondence with the evolution of the senses. The three major senses and the three first to demonstrate in order are, hearing, touch, sight. For the greater part of evolution, hearing is the guiding impulse of human life through egoic contact with the top of the head. Later, when the Ego descends a little lower, the etheric center which is active in connection with the pituitary body, is added, and man becomes responsive to subtler and higher vibrations; the occult correspondence to the physical sense of touch awakens. Finally, the third eye opens and the pineal gland simultaneously begins to function. At first, the sight is dim, and the gland is only partially responsive to vibration, but gradually the eye opens fully, the gland is fully active, and we have the "fully awakened" man." ...read more>>>...
