"If we are in silence - in absolute silence with no thoughts - for 10 minutes, it's only a thought that tells us we were silent for 10 minutes. Our only proof is a thought."

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You must realize first of all that you are the proof of everything, including yourself. None can prove your existence, because his existence must be confirmed by you first. Your being and knowing you owe nobody. Remember, you are entirely on your own. You do not come from somewhere, you do not go anywhere. You are timeless being and awareness.

— Sri Nisargadatta Maharaj