Tripura Rahasya,

Sage Dattatreya said,

Shortly after, Hemachuda regained his original state, owing to the mind again beginning to function. He reflected: "What is all this? Is it a dream or a hallucination of the mind? My experience is a fact but it surpasses my imagination. Why is that bliss unique and unlike any that I have experienced before? The highest of my known experiences cannot compare with even an iota of the state of bliss I was in just now. It was like sleep, in so far as I was not externally aware. But there was a peculiar bliss at the same time. The reason is not clear to me because there was nothing to impart pleasure to me. Although I attempt to know the Self, I do not do so. I see the Self differently now and again. What can it be? Is it darkness, light or pleasure? Or is it possible that these are successive forms of the Self? I do not understand it. Let me ask my recondite wife."