'Know it in just this way, dear boy,' he said: 'this body indeed dies when deserted by the life, but the life itself does not die. That which is this subtlest essence — this whole world has That as its self. That is the truth. That is the Self. That thou art (tat tvam asi), Svetaketu.' 'Venerable sir, instruct me still further.' 'So be it, dear boy,' he said.