Behind all particular ideas stands a generalised, an abstract principle; grasp it, and you have grasped everything. Just as this whole universe has been generalised in the Vedas into that One Absolute Existence, and he who has grasped that Existence has grasped the whole universe, so all forces have been generalised into this Prana, and he who has grasped the Prana has grasped all the forces of the universe, mental or physical. He who has controlled the Prana has controlled his own mind, and all the minds that exist. He who has controlled the Prana has controlled his body, and all the bodies that exist, because the Prana is the generalised manifestation of force.