Aldous Huxley -  In October 1955, Huxley had an experience while on LSD that he considered more profound than those detailed in The Doors of Perception. Huxley was overwhelmed to the point where he decided his previous experiments, the ones detailed in Doors and Heaven and Hell, had been nothing but "entertaining sideshows."

He wrote in a letter to Humphry Osmond, that he experienced "the direct, total awareness, from the inside, so to say, of Love as the primary and fundamental cosmic fact. ... I was this fact; or perhaps it would be more accurate to say that this fact occupied the place where I had been. ... And the things which had entirely filled my attention on that first occasion, I now perceived to be temptations – temptations to escape from the central reality into a false, or at least imperfect and partial Nirvanas of beauty and mere knowledge."