"On Prana. You can discover much on the nature of prana if you use.. my book A Treatise on Cosmic Fire and The Light of the Soul, [v] the whole subject is considered. Suffice it to say that: 1. There is nothing in manifestation except energy, taking form, using and actuating forms and dissipating forms. 2. This energy is divided into three types of so-called electrical phenomena, called in The Secret Doctrine and in A Treatise on Cosmic Fire, fire by friction, solar fire, and electrical fire. 3. Prana is the name given to the energy which is drawn upon the physical plane from the etheric aspect of all phenomenal life. That etheric aspect of the divine energy is a synthesis of energies. If the energy in which an individual primarily lives and moves and has the focus of his being is, for instance, predominantly astral, then the major expression of energy in his equipment will be astral or emotional feeling energy. He will react all the time to physical energy or prana and to astral energy or the many sentient emotional forces. These work out pre-eminently through the spleen, the solar plexus and the throat, and affect in different ways the physical spleen, the stomach and the thyroid gland. 4. Interest in these two types of energy, when evidenced by an individual, is based on the fact that they are the two in which he himself is habitually immersed and to which he most easily and normally responds."