I becoming the fire, and dwelling in the bodies of (all) creatures, and united with the upward and downward life-breaths, cause digestion of the fourfold food. And I am placed in the heart of all; from me (come) memory, knowledge, and their removal; I alone am to be learnt from all the Vedas; I am the author of the Vedantas; and I alone know the Vedas. There are these two beings in the world, the destructible and the indestructible. The destructible (includes) all things. The unconcerned one is (what is) called the indestructible.