Digging into Experience and Experiencer (opens in new tab)

Good. Now, ask yourself, what is aware of thought? What knows thought?—And then, look. Look comprehensively. Try to find what knows thought. It's interesting, that if you're really looking for what knows thought, it's very hard for any thoughts to arise. It's kind of fascinating. If you find yourself caught up in thought, the minute you notice, try to find what it is that knows thought—and just keep looking. Every thought that arises, what is it that knows that thought? What is it that knows ...