Hakuin Ekaku - Teachings - Koan Practice

Koan Practice

The most important and influential teaching of Hakuin was his emphasis on, and systematization of, koan practice. Hakuin deeply believed that the most effective way for a student to achieve insight was through extensive meditation on a koan. Only with incessant investigation of his koan will a student be able to become one with the koan, and attain enlightenment. The psychological pressure and doubt that comes when one struggles with a koan is meant to create tension that leads to awakening. Hakuin called this the "great doubt", writing, "At the bottom of great doubt lies great awakening. If you doubt fully, you will awaken fully".

Hakuin used a fivefold classification system: 1. Hosshin, dharma-body koans, are used to awaken the first insight into sunyata. They reveal the dharmakaya, or Fundamental. They introduce "the undifferentitated and the unconditional".
2. Kikan, dynamic action koans, help to understand the phenomenal world as seen from the awakened point of view; Where hosshin koans represent tai, substance, kikan koans represent yu, function.
3. Gonsen, explication of word koans, aid to the understanding of the recorded sayings of the old masters. They show how the Fundamental, though not depending on words, is nevertheless expressd in words, without getting stuck to words.
4. Hachi Nanto, eight "difficult to pass" koans. There are various explanations for this category, one being that these koans cut off clinging to the previous attainment. They create another Great Doubt, which shatters the self attained through satori. It is uncertain which are exactly those eight koans. Hori gives various sources, which altogether give ten hachi nanto koans. 5. Goi jujukin koans, the Five Ranks of Tozan and the Ten Grave Precepts.

Hakuin's systematization of koan practice brought about a major revolution in Zen teaching. In the system developed by Hakuin and his followers, students are assigned koans by their teacher and then meditate on them. Once they have broken through, they must demonstrate their insight in private interview with the teacher. If the teacher feels the student has indeed attained a satisfactory insight into the koan, then another is assigned. Hakuin's main role in the development of this koan system was most likely the selection and creation of koans to be used. In this he didn't limit himself to the classic koan collections inherited from China; he himself originated one of the best-known koans, "You know the sound of two hands clapping; tell me, what is the sound of one hand?". Hakuin preferred this new koan to the most commonly assigned first koan from the Chinese tradition, the Mu koan. He believed his "Sound of One Hand" to be more effective in generating the great doubt, and remarked that "its superiority to the former methods is like the difference between cloud and mud".

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