The mind of the Sage (jnani) never leaves Brahman (that is, Self). But the mind of the ignorant one (ajnani) is such that wandering in the world it suffers, and turning back to Brahman for a while enjoys happiness. What is called the world is nothing but thought. When the world disappears, that is, when there is no thought, the mind experiences bliss (ananda); when the world appears, it experiences misery.
- Ramana Maharshi in Who Am I?