I don't think it is overstating that the biggest challenge to robust Christian commitment in America today is its fascination with Eastern religion, often morphing on American soil. Alan Watts was a popularizer of Zen Buddhism in the 60's and 70's. This book is a compilation of lectures that Watts delivered on the topic of meditation. As you would expect, there is a great deal of practical wisdom and social critique. The non-striving, non-manipulating approach to meditation is instructive for Christians as well. Of course the appeal of adapting Buddhism to American consumerist culture is that you can pick and choose the parts of that tradition that best works for you. Ultimately this book has good things to say, but doesn't present a compelling vision of the Spiritual life.