And ‘Thou, O Shvetaketu,’ says the sage, ‘art That!’

By ‘That’ of course, he means, Sat, pure existence. You, your mind and body, and indeed, everything you see around you, are essentially nothing but pure existence, appearing in multifarious forms, courtesy of maya. Ignorance means being unaware of your Sat nature, and consequently being identified with the body-mind complex with all its attendant problems and sufferings. Enlightenment is just the reverse— being aware of yourself as Sat and being free of the body, mind and all samsara. You are the immortal, unchanging Sat and the world is a mere shadow, the projection of maya, passing over you. This does not actually destroy the body or the world—rather you begin to see things as they really are.