To give your sheep or cow a large, spacious meadow is the way to control him. So it is with people: first let them do what they want, and watch them. This is the best policy. To ignore them is not good; that is the worst policy. The second worst is trying to control them. The best one is to watch them, just to watch them, without trying to control them.

The same way works for you yourself as well. If you want to obtain perfect calmness in your zazen, you should not be bothered by the various images you find in your mind. Let them come, and let them go. Then they will be under control. But this policy is not so easy. It sounds easy, but it requires some special effort. How to make this kind of effort is the secret of practice.