"First, acknowledging it is called recognizing one's nature. Next, we must be decisive about what is recognized. This is more complicated, because who really decides? Is it conceptual mind that settles it? Or is it rigpa itself that decides? or is it your teacher who makes up your mind - "The guru said so, so it must be true"? Or will modern technology validate it for you? Could you go to the Rigpa Lab and check your heart and brain with instruments to decide if your rigpa is fine and fit, if your nonduality is in good shape?

How do you resolve this point? It may be tough to have to immediately endorse your own experience, but we can decide upon it if we feel even 60 percent confident that it's actually rigpa. As the basis for verifying, we use our teacher's words, the words of an authentic scripture, and our own experience. When our state of experiencing rigpa really is rigpa, there is within that an automatic feeling of certainty. To arrive at that certainty you need to give some time to the process, and you also need to have passion. There is a point at which the certainty is built-in, automatic certainty. Once we get to this natural, unshakable certainty, we feel so sure that even if the Buddha himself came before us and said, "Hey, you're wrong, it's not rigpa!" we would thank him for coming, but it would not change our certainty at all. At a certain point the qualities of empty essence, cognizant nature, and unconfined capacity become so utterly obvious that we really know. At this point, we have gained the certainty that whatever occurs in our minds can be freed by itself."

- Tsoknyi Rinpoche, Fearless Simplicity: The Dzogchen Way of Living Freely in a Complex World