Nishijima Roshi wrote a small book in the early 1970s titled "How to Practice Zazen", now long out of print, on which this book is based. In the foreward, he writes, "Among the flood of English books on Buddhism, there are relatively few books that explain true Buddhism based on Master Dogen's teachings. I am happy if this book fulfulls its purpose in introducing the essential Buddhist viewpoint to the world."