Experience

All that is known, or could ever be known, is experience. Struggle as we may with the implications of this statement, we cannot legitimately deny it. Being all that could ever be known, experience itself must be the test of reality. If we do not take experience as the test of reality, belief will be the only alternative. Experience and belief – or ‘the way of truth and the way of opinion’, as Parmenides expressed it in the fifth century BCE – are the only two possibilities.
The Nature of Consciousness
By Rupert Spira