The energies that act in the being
It is not possible to give a name to all the energies that act in the being. They are put into several classes. First are the mental thought energies (intelligence, dynamic mind, physical perceptive mind); the vital—1st emotional vital with all the emotional movements in it; 2nd the central vital (the larger desires, passions, ambitions, forces of work, possession, conquest); 3rd the lower vital (all the small egoistic movements of desire, enjoyment, lust, greed, jealousy, envy, vanity etc. etc.); 4th the physical energies concerned with the material life and its functioning, needs, outer action, instrumental fulfilment of the other powers.
Ref: Letters on Yoga – I
