The Secret Doctrine, Vol. 3 of 4 The Synthesis of...

The special physical organ of perception is the brain, and perception is located in the aura of the pineal gland. This aura answers in vibrations to any impressions, but it can only be sensed, not perceived, in the living man. During the process of thought manifesting in consciousness, a constant vibration occurs in the light of this aura, and a clairvoyant looking at the brain of a living man may almost count, see with the spiritual eye, the seven scales, the seven shades of light, passing from the dullest to the brightest. You touch your hand; before you touch it the vibration is already in the aura of the pineal gland, and has its own shade of colour. It is this aura which causes the wear and tear of the organ, by the vibrations it sets up. The brain, set vibrating, conveys the vibrations to the spinal cord, and so to the rest of the body. Happiness as well as sorrow sets up these strong vibrations, and so wears out the body. Powerful vibrations of joy or sorrow may thus kill.