In the practice of meditation, concentrating too heavily on the technique brings all kinds of mental activities, frustrations, and sexual and aggressive fantasies. So you keep just on the verge of your technique, with 25 percent of your attention. Another 25 percent is relaxing, a further 25 percent relates to making friends with oneself, and the last 25 percent connects with expectation—your mind is open to the possibility of something happening during this practice session.These four aspects of mindfulness have been referred to as the four wheels of a chariot.The ideal number of wheels we should have on our chariot is four, the four techniques of meditation: cencentration, openness, awareness, and expectation. That leaves a lot of room for play. That is the approach in the buddhadharma, the Buddhist teachings. A lot of people in the lineage have practiced that way and have actually achieved a perfect state of enlightenment in one lifetime.
Condensed from "Continuing Your Confusion," in The Path is the Goal: A Basic Handbook of Buddhist Meditation, pages 19 to 20.