A Manual for ContemplationAnother way to look at the Heart Sutra is that it represents a very condensed contemplation manual. It is not just something to be read or recited, but the intention is to contemplate its meaning in as detailed a way as possible. Since it is the Heart Sutra, it conveys the heart essence of what is called prajnaparamita, the “perfection of wisdom or insight.” In itself, it does not fuss around, or give us all the details. It is more like a brief memo for contemplating all the elements of our psychophysical existence from the point of view of what we are now, what we become as we progress on the Buddhist path, and what we attain (or do not attain) at the end of that path. If we want to read all the details, we have to go to the longer Prajnaparamita Sutras, which make up about twenty-one thousand pages in the Tibetan Buddhist canon—twenty-one thousand pages of “no.” The longest sutra alone, in one hundred thousand lines, consists of twelve large books.
The Prajnaparamita SutrasThe Heart Sutra is on the lower end, so to speak, and the shortest sutra consists of just one letter, which is my personal favorite. It starts with the usual introduction, “Once the Buddha was dwelling in Rajagriha at Vulture Flock Mountain” and so on, and then he said, “A.” It ends with all the gods and so on rejoicing, and that’s it. It is said that there are people who actually realize the meaning of the Prajnaparamita Sutras through just hearing or reading “A.”
A Big KoanBesides being a meditation manual, we could also say that the Heart Sutra is like a big koan. But it is not just one koan, it is like those Russian dolls: there is one big doll on the outside and then there is a smaller one inside that first one, and there are many more smaller ones in each following one. Likewise, all the “nos” in the big koan of the sutra are little koans. Every little phrase with a “no” is a different koan in terms of what the “no” relates to, such as “no eye,” “no ear,” and so on.
The Heart Sutra is like a big koanIt is an invitation to contemplate what that means. “No eye,” “no ear” sounds very simple and very straightforward, but if we go into the details, it is not that straightforward at all. In other words, all those different “no” phrases give us different angles or facets of the main theme of the sutra, which is emptiness. Emptiness means that things do not exist as they seem, but are like illusions and like dreams. They do not have a nature or a findable core of their own. Each one of those phrases makes us look at that very same message. The message or the looking are not really different, but we look at it in relation to different things. What does it mean that the eye is empty? What does it mean that visible form is empty? What does it mean that even wisdom, buddhahood, and nirvana are empty?