Among the other classic tales of Huai-hai's apprenticeship under Ma-tsu is the often repeated account of the day the two of them were walking together along a path when suddenly a flock of migratory geese was heard passing overhead. Ma-tsu turned to his pupil and asked, "What was that sound?" Huai-hai innocently replied, "It was the cry of wild geese." Ma-tsu paused and then demanded of his pupil, "Where have they gone?" Huai-hai said, "They have flown away."
This was an unacceptably drab, straightforward answer for a Zen man, and in disgust Ma-tsu whirled, grabbed Huai-hai's nose, and twisted it until his disciple cried out in panic, causing Ma-tsu to observe, "So you thought they had flown away. Yet they were here all the time."3
The legends say that this exchange, in the typical harsh style of Ma- tsu, caused Huai-hai to confront his original nature. What Ma-tsu had done was to give his pupil a vivid lesson in the concept of an indivisible unity which pervades the world; things do not come and go-- they are there always, part of a permanent fabric. Huai-hai was being invited to stop viewing the world as a fragmented collection of elements and see it rather as a unified whole.
The interactions of master and novice were always dynamic. For example, another story says that one day Ma-tsu asked Huai-hai how he would teach Ch'an. Huai-hai responded by holding up a dust whisk vertically. Ma-tsu continued by asking him, "Is this all there is? Is there nothing more?" Huai-hai replied by throwing down the whisk. (One interpreter has said that raising the dust whisk revealed the mind's function, whereas throwing it down returned function to the mind's substance.)4 According to some versions of this episode, Ma-tsu responded by shouting at the top of his lungs, rendering Huai-hai deaf for three days. This shout is said to have been the occasion of Huai-hai's final enlightenment.
Huai-hai seems to have been a kindly man, warm and personable, not given to the roughhouse methods of some of his contemporaries. Instead of flamboyance, we find a friendly type who concentrated on guiding a community of disciples (sometimes called a "Zen forest") and giving a helping hand to all. We will pass over the many other anecdotes involving his stay with Ma-tsu and turn instead to his more significant contributions to the growth of Ch'an.5 These fall into two major categories: First, he founded the first wholly Ch'an monastery and for it formulated a set of monastic rules that are today still respected in Zen monasteries; and second, he was one of the first Southern Ch'an masters to explore the psychology of "sudden enlightenment" and to write a lucid analysis of the mental preparation it required.