120 million of us place the big bang 2,500 years after the Babylonians and Sumerians learned to brew beer. - Sam Harris

While the philosophy of Advaita, and Ramana’s own words, may tend to support a metaphysical reading of teachings of this kind, their validity is not metaphysical. Rather, it is experiential. The whole of Advaita reduces to a series of very simple and testable assertions: Consciousness is the prior condition of every experience; the self or ego is an illusory appearance within it; look closely for what you are calling “I,” and the feeling of being a separate self will disappear; what remains, as a matter of experience, is a field of consciousness — free, undivided, and intrinsically uncontaminated by its ever-changing contents.

But if they don’t try a psychedelic like psilocybin or LSD at least once in their adult lives, I will wonder whether they had missed one of the most important rites of passage a human being can experience.

And then came the insight that irrevocably transformed my sense of how good human life could be. I was feeling boundless love for one of my best friends, and I suddenly realized that if a stranger had walked through the door at that moment, he or she would have been fully included in this love. Love was at bottom impersonal — and deeper than any personal history could justify. Indeed, a transactional form of love — I love you because. . . — now made no sense at all.