Doctrinal background of Zen
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The Prajnaparamita-sutras and Madhyamaka emphasized the non-duality of form and emptiness: "form is emptiness, emptiness is form", as the heart sutra says. This was understood to mean that ultimate reality is not a transcendental realm, but equal to the daily world of relative reality. This idea fitted into the Chinese culture, which emphasized the mundane world and society. But this does not tell how the absolute is present in the relative world:
To deny the duality of samsara and nirvana, as the Perfection of Wisdom does, or to demonstrate logically the error of dichotomizing conceptualization, as Nagarjuna does, is not to address the question of the relationship between samsara and nirvana -or, in more philosophical terms, between phenomenal and ultimate reality [...] What, then, is the relationship between these two realms?
Buddha-nature and sunyata 
When Buddhism was introduced in China it was understood in terms of its own culture. Various sects struggled to attain an understanding of the Indian texts. The Tathāgatagarbha Sutras and the idea of the Buddha-nature were endorsed, because of the perceived similarities with the Tao, which was understood as a transcendental reality underlying the world of appearances. Sunyata at first was understood as pointing to the Taoist "wu", nothingness.
The doctrine of the Buddha-nature asserts that all sentient beings have Buddha-nature (Skt. Buddhadhātu, "Buddha Element", "Buddha-Principle"), the element from which awakening springs. The Tathāgatagarbha Sutras (literally: the womb of the thus-gone) state that every living being has the potential to realize awakening. Hence Buddhism offers salvation to every-one, not only to monks or those who have freed themselves almost completely from karma in previous lives. The Yogacara theory of the Eight Consciousnesses explains how sensory input and the mind create the world we experience, and obscure the alaya-vijnana, which is equated to the Buddha-nature.
When this potential is realized, and the defilements have been eliminated, the tathagatagarbha manifests as the Dharmakaya, the absolute reality which pervades everything in the world. In this way, it is also the primordial reality from which phenomenal reality springs. When this understanding is idealized, it becomes a transcendental reality beneath the world of appearances.
Sunyata points to the "emptiness" or no-"thing"-ness of all "things". Though we perceive a world of concrete and discrete objects, designated by names, on close analysis the "thingness" dissolves, leaving them "empty" of inherent existence. The Heart sutra, a text from the prajnaparamita-sutras, articulates this in the following saying in which the five skandhas are said to be "empty":
"Oh, Sariputra, Form Does not Differ From the Void,
And the Void Does Not Differ From Form.Perceptions, Volitions and Consciousness".[web 1]
Form is Void and Void is Form;
The Same is True For Feelings,
The Yogacara explains this "emptiness" in an analysis of the way we perceive "things". Everything we conceive of is the result of the working of the five skandhas—results of perception, feeling, volition, and discrimination.[note 2] The five skandhas together compose consciousness. The "things" we are conscious of are "mere concepts", not Ding an sich.
It took Chinese Buddhism several centuries to recognize that sunyata does not refer to "wu", nothingness, nor does Buddhism postulate an undying soul. The influence of those various doctrinal and textual backgrounds is still discernible in Zen. Zen teachers still refer to Buddha-nature, but the Zen tradition also emphasizes that Buddha-nature is sunyata, the absence of an independent and substantial self.
Sudden and gradual enlightenment 
In Zen Buddhism two main views on the way to enlightenment are discernible, namely sudden and gradual enlightenment.
Early Chán recognized the "transcendence of the body and mind", followed by "non-defilement [of] knowledge and perception", meaning sudden insight into the true nature followed by gradual purification of intentions.
In the 8th-century the Ch'an-history was effectively re-fashioned by Shenhui, who created a dichotomy between the so-called "Northern School", led by Yuquan Shenxiu, and his own line of teaching, which he called the "Southern school". Shenhui placed Hui-neng into prominence as the sixth Chán-patriarch, and emphasized sudden enlightenment, as opposed to the concurrent Northern School's alleged gradual enlightenment. According to the sudden enlightenment propagated by Shenhui insight into true nature is sudden; there-after there can be no misunderstanding anymore about this true nature.
In the Platform Sutra the dichotomy between sudden and gradual is reconciled. Guifeng Zongmi, fifth-generation successor to Shenhui, also softened the edge between sudden and gradual. In his analysis, sudden awakening points to seeing into one's true nature, but is to be followed by a gradual cultivation to attain Buddhahood.
Chinul, a 12th-century Korean Seon master, followed Zongmi, and also emphasized that insight into our true nature is sudden, but is to be followed by practice to ripen the insight and attain full Buddhahood. This is also the standpoint of the contemporary Sanbo Kyodan, according to whom kensho is at the start of the path to full enlightenment.
This gradual cultivation is also recognized by Tozan, who described the Five ranks of enlightenment.[web 3] Other example of depiction of stages on the path are the Ten Ox-Herding Pictures which detail the steps on the Path, The Three mysterious Gates of Linji, and the Four Ways of Knowing of Hakuin. This gradual cultivation is described by Chan Master Sheng Yen as follows:
Ch'an expressions refer to enlightenment as "seeing your self-nature". But even this is not enough. After seeing your self-nature, you need to deepen your experience even further and bring it into maturation. You should have enlightenment experience again and again and support them with continuous practice. Even though Ch'an says that at the time of enlightenment, your outlook is the same as of the Buddha, you are not yet a full Buddha.
The emphasis which Shenhui placed on sudden enlightenment, also reflected a growing appreciation of the Diamond Sutra in 8th-century Chinese Buddhism. The Lankavatara-sutra, which endorses the Buddha-nature, emphasized purity of mind, which can be attained in gradations. The Diamond-sutra emphasizes sunyata, which "must be realized totally or not at all".
Once the dichotomy between sudden and gradual was in place, it defined its own logic and rhetorics, which are also recognizable in the distinction between Caodong (Soto) and Lin-ji (Rinzai) chán. But it also leads to a "sometimes bitter and always prolix sectarian controversy between later Chán and Hua-yen exegetes". In the Huayan classification of teachings, the sudden approach was regarded inferior to the Perfect Teaching of Hua-yen. Guifeng Zongmi, fifth patriarch of Hua-yen ànd Chán-master, deviced his own classification to counter this subordination. To establish the superiority of the Chán-teachings, Chinul explained the sudden approach as not pointing to mere emptiness, but to suchness or the dharmadhatu.
Esoteric and exoteric transmission 
According to Borup the emphasis on 'mind to mind transmission' is a form of esoteric transmission, in which "the tradition and the enlightened mind is transmitted face to face". Metaphorically this can be described as the transmission from a flame from one candle to another candle,, or the transmission from one vein to another. In exoteric transmission requires "direct access to the teaching through a personal discovery of one's self. This type of transmission and identification is symbolized by the discovery of a shining lantern, or a mirror."
This polarity is recognizable in the emphasis that the Zen-tradition puts on maintaining the correct Dharma transmission, while simultaneously stressing seeing into one's nature:
The matter of learning from a teacher is most essential. People of old who arrived at the source of seeing nature, passed through many barriers clearly and completely without a dot of doubt, and utraveled freely through the world opening big mouths in discussion, only came to know the transcendental message of Zen after they finally ran into Zen masters of great vision. Then they sincerely sought certainty and wound up with the duty of the teacher's succession, bearing the debt of Dharma, never to forget it for a moment. This is called dharma succession. Since ancient times the designated succession of the ancestral teachers has always been like this.[note 3]
Nevertheless, while the Zen tradition has always stressed the importance of formal Dharma transmission, there are well known examples of Mushi dokugo, such as Nōnin, Jinul and Suzuki Shōsan who attained awakening on their own, though all of them were familiair with the Zen-teachings.
The Bodhisattva ideal 
An important, though easily overlooked aspect of Zen is the bodhisattva ideal. It supplements kensho and insight into the absolute with Karuṇā, compassion with all sentient beings. This ideal is reflected in the Bodhisattva vow and the Bodhisattva Precepts or jukai.[web 4]
Part of this Bodhisattva-ideal are the pāramitās, which are also being mentioned in the Diamond Sutra:
- Dāna (generosity, giving of oneself),
- Śīla (virtue, morality, proper conduct),
- Kṣānti (patience, tolerance, forbearance, acceptance, endurance),
- Vīrya (energy, diligence, vigour, effort),
- Dhyāna (meditation, tranquility), and
- Prajñā (wisdom, insight).[note 4]
The Bodhisattva-ideal is a central theme in the prajnaparamita-sutras.
Hakuin saw "deep compassion and commitment to help all sentient beings everywhere" as an indispensable part of the Buddhist path to awakening. Hakuin emphasized the need op "post-satori training", purifying the mind of karmic tendencies and
[W]hipping forward the wheel of the Four Universal Vows, pledging yourself to benefit and save all sentient beings while striving every minute of your life to practice the great Dharma giving.
The insight in the need of arousing bodhicitta formed Hakuin's final awakening:
Wasn't a shaven head and monk's robe the Mind of Enlightenment? Wasn't reciting sutras, mantras, and dharanis the Mind of Enlightenment? [...] [At] my forty-first year, [...] I at long last penetrated into the heart of this great matter. Suddenly, unexpectedly, I saw it — it was as clear as if it were right there in the hollow of my hand. What is the Mind of Enlightenment? It is, I realized, a matter of doing good — benefiting others by giving them the gift of the Dharma teaching.
By repeatedly chanting the Avalokiteshvara sutra (観世音菩薩普門品 Kanzeon Bosatsu Fumonbon ) (chapter 25 of the Lotus Sutra[web 7]), for example, one instills the Bodhisattva's ideals into ones mind. The ultimate goal is given in the end of the sutra, which states, "In the morning, be one with Avalokiteshvara; in the evening, be one with Avalokiteshvara". Through the realization of emptiness and the Mahayana notion that all things have Buddha-nature, one understands that there is no difference between the cosmic bodhisattva and oneself. The wisdom and compassion of the Bodhisattva one is chanting to is seen to equal the inner wisdom and compassion of the practitioner. Thus, the duality between subject and object, practitioner and Bodhisattva, chanter and sutra is ended.
See also 
- The influence of these teachings can be seen in the sayings of Mazu:
Master Liang visited Ma-tsu.
Ma-tsu said: I heard that the master is great at explaining the sutras and sastras, is that so?
Liang said: Indeed
Ma-tsu said: With what do you explain?
Liang said: I explain with the mind
Ma-tsu said: The mind is like an artist and consciousness is [like] his helper, how can you explain the teachings with that?
- Translations do differ, which makes a difference. Vijñāna can be translated as "consciousness", but also as "discernment".
- The modern framing of Zen as the experience of 'ultimate truth' or reality may influence the institutional shape western Zen is going to take, where individual freedom is highly appraised. See also Bodiford 2008, pp 277-279
- Wai-tao and Goddard re-arranged their translation of the Diamond Sutra topically, using the six paramitas as a framework
-  mentions: Blofeld, John (1988), Bodhisattva of compassion - the mystical tradition of kuan Yin. Boston: Shanbhala
Written references 
- Dumoulin 2005-A, p. 85-94.
- McRae 2003, pp. 138–142.
- Liang-Chieh 1986:9
- Kasulis 2003, pp. 26–29.
- McRae 2003, pp. 123–138.
- Borup 2008, p. 9.
- Kasulis 2003:29
- Low 2006.
- Lai Year unknown.
- Swanson 1993, p. 373.
- Wayman 1990.
- Kalupahana 1992.
- Kalupahan 1994.
- Kalupahan 1994, p. 160-169.
- Lievens 1981, p. §19, p.105-106.
- Swanson 1993.
- McRae 2003, p. 88-92.
- McRae 2003, p. 54-56.
- MacRae 2003, p. 60-67.
- Gregory 1991.
- Kapleau 1989.
- Yen 2006, p. 54).
- McRae 2003, p. 62.
- Kasulis 2003, pp. 26–28.
- McRae 2003, p. 123.
- Buswell 1993, p. 234.
- Buswell 1991, p. 240-241.
- Faure 2000, p. 58.
- Torei 2010, p. 88.
- Sharf 2005-B.
- Batchelor 2004.
- Anderson 2000.
- Wai-tao 1994.
- Aitken 1994.
- Dumoulin 2005-A, p. 41.
- Low 2006, p. 35.
- Waddell 2010.
- Hakuin 2010.
- Lathouwers 2000
- Lathouwers 2000, p. 221.
Web references 
- The Heart Sutra Prajna Paramita Hrydaya Sutra
- Lankavatara Sutra, chapter LXXXII, p.192 Suzuki-translation, p.223/224 in brackets
- The Five Ranks of Tozan
- Dogen, On Receiving the Precepts
- Dogen, Sobogenzo, On Kannon, the Bodhisattva of Compassion
- dogen, Shobogenzo, On the Four Exemplary Acts of a Bodhisattva
- Avalokiteśvara Sutra
- Blyth, R. H. (1966), Zen and Zen Classics, Volume 4, Tokyo: Hokuseido Press
- Borup, Jørn (2008), Japanese Rinzai Zen Buddhism: Myōshinji, a Living Religion, Brill
- Brown Holt, Linda (1995), "From India to China: Transformations in Buddhist Philosophy", Qi: The Journal of Traditional Eastern Health & Fitness
- Buswell, Robert E. (1991), The "Short-cut" Approach of K'an-hua Meditation: The Evolution of a Practical Subitism in Chinese Ch'an Buddhism. In: Peter N. Gregory (editor) (1991), Sudden and Gradual. Approaches to Enlightenment in Chinese Thought, Delhi: Motilal Banarsidass Publishers Private Limited
- Buswell, Robert E (1993), Ch'an Hermeneutics: A Korean View. In: Donald S. Lopez, Jr. (ed.)(1993), Buddhist Hermeneutics, Delhi: Motilal Banarsidass
- Chang, Chung-Yuan (1967). "Ch'an Buddhism: Logical and Illogical". Philosophy East and West 17 (1/4): 37–49. doi:10.2307/1397043. JSTOR 1397043.
- Cleary, Thomas (2005), Classics of Buddhism and Zen: Volume One, Boston, MA: Shambhala publications, ISBN 1-57062-831-9
- Dumoulin, Heinrich (2005-A), Zen Buddhism: A History. Volume 1: India and China, World Wisdom Books, ISBN 978-0-941532-89-1
- Faure, Bernard (1997), The Will to Orthodoxy: A Critical Genealogy of Northern Chan Buddhism, Stanford University Press
- Faure, Bernard (2000), Visions of Power. Imaging Medieval Japanese Buddhism, Princeton, New Jersey: Princeton University Press
- Ferguson, Andy (2000), Zen's Chinese Heritage, Boston, MA: Wisdom Publications, ISBN 0-86171-163-7
- Fowler, Merv (2005), Zen Buddhism: Beliefs and Practices, Sussex Academic Press
- Gimello, Robert M. (1994), Marga and Culture: Learning, Letters, and Liberation in Northern Sung Ch'an. In: Buswell & Gimello (editors)(1994), Paths to Liberation. Pages 475-505, Delhi: Motilal Banarsidass Publishers
- Goddard, Dwight (2007), History of Ch'an Buddhism previous to the times of Hui-neng (Wie-lang). In: A Buddhist Bible, Forgotten Books
- Gregory, Peter N. (1991), Sudden Enlightenment Followed by Gradual Cultivation: Tsung-mi's Analysis of mind. In: Peter N. Gregory (editor)(1991), Sudden and Gradual. Approaches to Enlightenment in Chinese Thought, Delhi: Motilal Banarsidass Publishers Private Limited
- Gregory, Peter N. (2002), Tsung-mi and the Sinification of Buddhism, University of Hawai’i Press, Kuroda Institute, (originally published Princeton University Press, 1991, Princeton, N.J.), ISBN 0-8248-2623-X
- Grigg, Ray (1999), The Ta of Zen, Edison, NJ: Alva Press
- Heine, Steven (2008), Zen Skin, Zen Marrow
- Isshū, Miura; Sasaki, Ruth F. (1993), The Zen Koan, New York: Harcourt Brace & Company, ISBN 0-15-699981-1
- Huaijin, Nan (1997), Basic Buddhism: exploring Buddhism and Zen, Samuel Weiser
- Kapleau, Philip (1989), The three pillars of Zen
- Kasulis, Thomas P. (2003), Ch'an Spirituality. In: Buddhist Spirituality. Later China, Korea, Japan and the Modern World; edited by Takeuchi Yoshinori, Delhi: Motilal Banarsidass
- Lathouwers, Ton (2000), Meer dan een mens kan doen. Zentoespraken, Rotterdam: Asoka
- Leighton, Taigen Daniel (2000), Cultivating the Empty Field: The Silent Illumination of Zen Master Hongzhi, Tuttle Publishing, ISBN 978-0-8048-3240-3
- Liang-Chieh (1986), The Record of Tung-shan, Kuroda Institute Unknown parameter
- Low, Albert (2006), Hakuin on Kensho. The Four Ways of Knowing, Boston & London: Shambhala
- Maspero, Henri (1981), Taoism and Chinese Religion, University of Massachusetts Press, ISBN 0-87023-308-4
- McMahan, David L. (2008), The Making of Buddhist Modernism, Oxford University Press, ISBN 978-0-19-518327-6
- McRae, John (2003), Seeing Through Zen, The University Press Group Ltd
- Meng-Tat Chia, Jack (2011), "A Review of Enlightenment in Dispute: The Reinvention of Chan Buddhism in Seventeenth-Century China", Journal of Buddhist Ethics. Volume 18, 2011
- Oh, Kang-nam (2000), "The Taoist Influence on Hua-yen Buddhism: A Case of the Scinicization of Buddhism in China", Chung-Hwa Buddhist Journal, No. 13, (2000)
- Sharf, Robert H. (2002), On Pure Land Buddhism and Ch'an/Pure Land Syncretism in Medieaval China, Leiden, Netherlands: Brill
- Shimano, Eido T. (1991), Points of Departure: Zen Buddhism with a Rinzai View, Livingston Manor, NY: The Zen Studies Society Press, ISBN 0-9629246-0-1
- Suzuki, D.T. (1935), Manual of Zen Buddhism
- Suzuki, D.T. (1955), Studies in Zen, New York: Delta
- Suzuki, D.T. (1970), Zen and Japanese Culture, New York: Bollingen/Princeton University Press, ISBN 0-691-09849-2
- Suzuki, D.T. (2004), The Training of the Zen Budhist Monk, Tokyo: Cosimo, inc., ISBN 1-59605-041-1
- Torei (2010), The Undying Lamp of Zen. The Testament of Zen Master Torei, Boston & London: Shambhala Unknown parameter
- Wegner, Michael (2001), Introduction to "Branching streams flow in the darkness: Zen talks on the Sandokai"by Shunryū Suzuki, University of California Press, ISBN 978-0-520-23212-9
- Welter, Albert (year unknown-B), The Formation of the Linji lu: An Examination of the Guangdeng lu/Sijia yulu and Linji Huizhao Chanshi yulu. Versions of the Linji lu in Historical Context
- Welter, Albert (2000), Mahakasyapa's smile. Silent Transmission and the Kung-an (Koan) Tradition. In: Steven Heine and Dale S. Wright (eds)(2000): "The Koan. Texts and Contexts in Zen Buddhism, Oxford: Oxford University Press
- Yampolski, Philip B. (1967), The Platform Sutra of the Sixth Patriarch. Translated with notes by Philip B. Yampolski, Columbia University Press, ISBN 0-231-08361-0
- Yampolski, Philip (2003-A), Chan. A Historical Sketch. In: Buddhist Spirituality. Later China, Korea, Japan and the Modern World; edited by Takeuchi Yoshinori, Delhi: Motilal Banarsidass
- Yampolski, Philip (2003-B), Zen. A Historical Sketch. In: Buddhist Spirituality. Later China, Korea, Japan and the Modern World; edited by Takeuchi Yoshinori, Delhi: Motilal Banarsidass
- Yen, Chan Master Sheng (1996), Dharma Drum: The Life and Heart of Ch'an Practice, Boston & London: Shambhala
- Young, Stuart (2009), Linji Lu and Chinese Orthodoxy. Review of "Albert Welter. The Linji lu and the Creation of Chan Orthodoxy: The Development of Chan's Records of Sayings Literature.
- Zvelebil, K.V. (1987), "The Sound of the One Hand", Journal of the American Oriental Society 107(1)
Further reading 
- Paul Reps & Nyogen Senzaki, Zen Flesh, Zen Bones
- Philip Kapleau, The Three Pillars of Zen
- Shunryu Suzuki, Zen Mind, Beginner's Mind
- Dumoulin, Heinrich (2005), Zen Buddhism: A History. Volume 1: India and China. World Wisdom Books. ISBN 978-0-941532-89-1
- Dumoulin, Heinrich (2005), Zen Buddhism: A History. Volume 2: Japan. World Wisdom Books. ISBN 978-0-941532-90-7
- Mcrae, John (2003), Seeing through Zen. Encounter, Transformation, and Genealogy in Chinese Chan Buddhism. The University Press Group Ltd . ISBN 978-0-520-23798-8
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