Huatou is a skillful method for breaking through the prison of mental habits into the spacious mind of enlightenment. The huatou is a confounding question much like a Zen koan. Typical ones are "What is wu [nothingness]?" or "What was my original face before birth-and-death?" But a huatou is unlike a koan in that the aim is not to come up with an answer. The practice is simple: ask yourself your huatou relentlessly, in meditation as well as in every other activity. Don't give up on it; don't try to think your way to an answer. Resolve to live with the sensation of doubt that arises, and it will pervade your entire existence with a sense of profound wonder, ultimately leading to the shattering of the sense of an independent self.
Master Sheng Yen brings the traditional practice to life in this practical guide based on talks he gave during a series of huatou retreats. He teaches the method in detail, giving advice for dealing with the typical pitfalls and problems that arise, and answering retreat participants' questions as they experience the practice themselves. He then offers commentary on four classic huatou texts, grounding his instructions in the teaching of the great Chan masters.
I never was drawn to koan study, but during the years of my Korean Seon study, the main meditation practice I was given by my teacher was hwadu which is the Korean term for the Chinese Chan (Zen) practice of huatou. This in turn is considered the "head" or essence of a koan and is a question that ultimately reduces to the question of the "Great Matter" of birth and death.
The late Chan Master, Sheng-yen taught both the "Silent Illumination" of the Cao-tsong school and the questioning method of the huatou. In this little gem of a book, he tackles the huatou. Considering the nature of the practice, it is less a "how-to" manual than a descriptive map to the approach to practice. As with koan study, Great Doubt (which I prefer to call Great Questioning), Great Faith (which I prefer to call Great Confidence) and Great Determination are the "Three Pillars" upon which the practice is supported.
Huatou is definitely NOT for everyone. I will soon be posting to my Zen Naturalism blog an essay on the two approaches to Zen Meditation: shikantaza and koan/hwadu study. As I mention there, which practice one takes up is determined greatly by one's temperament. But even, if like me, you do not much care for nor have a proclivity for koan or huatou (by the way, in Japanese it's wato but you rarely see that nor practice that in the contemporary Zen traditions) reading a book such as this can also help your sitting practice, whatever it may be. After all, sitting in Silent Illumination, the "Don't Know Mind" IS the mind of Great Questioning, Great Confidence and Great Determination, too!