This book only exists because there is a market for people who teach classes on Christian mysticism. Reading 10 pages from 21 different authors can give you some insight, but only from a historical point of view, in my opinion. Any class would be better off taking one or two works and focusing on them in depth, rather than this skim across the top. I don't blame the editors, of course; they're just filling a need. And the authors themselves are brilliant, of course.