"a new teaching appointment required that I become familiar with mysticism in Christianity and other religions. That's when I realized that these were mystical experiences. Especially important was William James's classic book The Varieties of Religious Experience, published more than a century ago, still in print, and named by a panel of experts in 1999 as the second most important nonfiction book published in English in the twentieth century. The book combines the elements that made up James himself: a psychologist fascinated by the varieties of human consciousness, and a philosopher pondering what all of this might mean.1 Part of his book is about mystical experiences. Based on James's study of accounts of such experiences, he concluded that their two primary features are "illumination" and "union." Illumination has a twofold meaning. The experiences often involve light, luminosity, radiance. Moreover, they involve "enlightenment," a new way of seeing. "Union" (or "communion") refers to the experience of connectedness and the disappearance or softening of the distinction between self and world. In addition, James names four other common features: Ineffability. The experiences are difficult, even impossible, to express in words. Yet those who have such experiences often try, usually preceded by, "It's really hard to describe, but it was like . . ." Transiency. They are usually brief; they come and then go. Passivity. One cannot make them happen through active effort. They come upon one--one receives them. Noetic quality. They include a vivid sense of knowing (and not just intense feelings of joy, wonder, amazement)--a nonverbal, nonlinguistic way of knowing marked by a strong sense of seeing more clearly and certainly than one ever has. What is known is "the way things are" when all of our language falls away and we see "what is" without the domestication created by our words and categories. This way of knowing might be called direct cognition, a way of knowing not mediated through language. Reading James and other writers on mysticism was amazing. In colloquial language, I was blown away. I found my experiences described with great precision. Suddenly, I had a way of naming and understanding them. Moreover, they were linked to the experiences of many people. They are a mode of human consciousness. They happen. And"