Fire is the Divine Energy concealed in creation. It is the source of light (knowledge) and heat (power) or Consciousness-Force (Chit tapas) that we see everywhere and in everything though conditioned and concealed by the medium. In Matter it is called as jad agni which is concealed in the atom as well as in the base of the human body as Kundalini Shakti. In the mid regions (mind) it manifests as lightning or vidyut agni that brings intuition into play. Above it is in its own home, the Supramental where it is called as saur agni which is the Source of all Wisdom and Power.
In the kathopanishad it is described as the triple fire in the mind, life and body whose seat is in the soul (the aspiration in the psychic being).