Wonhyo (元曉, प्रभाकर - Prabhākara / अरुणोदय - Aruṇodaya; ཝོན་ཧྱོ། won hyo Wönhyo, Dawn of Buddhism), universally revered across Korea, China, Japan, and East Asia as the greatest thinker and harmonizer in Korean Buddhist history and the illustrious 7th century contemporary of Woncheuk (613–696), stands as the towering architect of Tongbulgyo (Interpenetrated Buddhism) and the philosophy of One Mind (Ilshim). With his year of birth in 617 and his year of death in 686, Wonhyo was born into a devout family in Gyeongsan (Apsan) near Gyeongju in the Silla Kingdom on the Korean Peninsula as Seol Seodang, beneath a chestnut tree where miraculous auspicious signs accompanied his delivery. Displaying extraordinary intellectual brilliance, poetic intuition, and spiritual sensitivity from early childhood, he initially trained in the aristocratic Hwarang youth corps before experiencing deep insight into the pervasive reality of anicca and dukkha, practicing fearless renunciation, taking formal refuge in the Buddha, the Dharma, and the Sangha, and entering the monastic order around the age of twenty-nine to master the complete Chinese Tripitaka.
In 650 and again in 661, Wonhyo set out on foot alongside his lifelong Dharma friend Uisang (625–702) with the fervent intention of traveling across the sea to Tang dynasty China to study the newly imported Yogacara scriptures directly under Xuanzang (602–664). During their second journey in 661, caught in a torrential nocturnal rainstorm near the coast, the two monks took shelter inside what appeared in the darkness to be a dry earthen cave; parched with thirst during the night, Wonhyo groped in the dark, found a gourd-shaped vessel brimming with cool, sweet water, drank deeply, and slept peacefully. Upon waking at dawn, Wonhyo discovered to his horror that they had slept inside an ancient tomb and that the vessel from which he had drunk was a decaying human skull filled with rainwater, causing him to retch violently—and in that very instant of physical revulsion, Wonhyo experienced sudden, complete awakening, realizing that all phenomena across samsara and nirvana are projected solely by the mind (Sarvam cittamatram), turned back to Korea without ever needing to visit China, and dedicated his life to liberating sentient beings.
Following this transformative enlightenment, Wonhyo voluntarily relinquished his formal monastic robes, adopted the secular lay appellation Soseong Geosa (Little-Nature Layman), and wandered freely across towns, taverns, marketplaces, and mountain hermitages throughout Silla Korea. Dancing with a gourd instrument, singing popular songs infused with profound Dharma meaning, and teaching illiterate peasants and royal monarchs alike without discriminating between sacred and profane, Wonhyo embodied fearless non-attachment, equanimity, and supreme skillful means, transforming the religious landscape of the Korean Peninsula.
Literarily, Wonhyo composed an astonishing corpus of over eighty-six works totaling more than two hundred and forty fascicles—of which twenty-three complete or partial treatises survive in the Chinese Tripitaka and Korean Buddhist canon—exercising a profound influence not only in Korea but also upon major Chinese and Japanese masters such as Fazang (643–712) and Gyōnen. Among his most celebrated masterpieces are the Daeseung Gisillon So (大乘起信論疏, Commentary on the Awakening of Faith in the Mahayana, Taisho Number 1844), which elucidated Ashvaghosha's Awakening of Faith in the Mahayana (Taisho Number 1666); the Geumgang Sammaegyeong Ron (金剛三昧經論, Exposition of the Vajrasamadhi Sutra, Taisho Number 1730); and his monumental ten-fascicle synthesis, the Simmun Hwajaeng Non (十門和諍論, Treatise on the Harmonization of Disputes in Ten Aspects).
Philosophically, Wonhyo formulated the luminous doctrine of Hwajaeng (和諍, Harmonization of Disputes), which resolved the bitter sectarian controversies dividing Madhyamaka and Yogacara scholastics across East Asia. Grounding his system in the Awakening of Faith in the Mahayana and the Avatamsaka Sutra (Taisho Number 278 and Toh Number 44 in the Tibetan Tripitaka), Wonhyo demonstrated that all seemingly contradictory scriptural views are partial perspectives arising from the single, indivisible source of One Mind (Ilshim), which encompasses two inseparable gateways: the Gateway of Mind as Suchness (True Suchness, tathata, corresponding to ultimate emptiness - शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid) and the Gateway of Mind as Arising and Ceasing (samsara, corresponding to dependent origination and dependent co-arising).
Through this non-dual synthesis, Wonhyo harmonized Nagarjuna's dialectics on emptiness of self and anatta with Asanga and Vasubandhu's consciousness-only phenomenology and the luminous Buddha-nature (tathagatagarbha) teachings of the Mahaparinirvana Sutra (Taisho Number 374 and Toh Number 119) and Maitreya's Uttaratantra Shastra (Toh Number 4024 and Taisho Number 1611). Showing practitioners that clinging to the five aggregates, karma, and rebirth dissolves naturally when One Mind recognizes its own primordially pure essence, Wonhyo guided disciples through single-pointed meditation, mindfulness, and concentration to uproot the three poisons of greed, hatred, and delusion.
At the same time, Wonhyo emphasized that lofty philosophical right view must express itself through joyful devotional practice and everyday ethical action, authoring influential commentaries on the Amitabha Sutra (Taisho Number 366 and Toh Number 115) and Sukhāvatīvyūha Sūtra (Taisho Number 360) that popularized the recitation of Amitabha Buddha's name among common villagers while anchoring daily conduct in Shakyamuni Buddha's foundational teachings on the Four Noble Truths, the Noble Eightfold Path, ethical conduct, precepts, generosity, merit, loving-kindness, compassion, and universal bodhicitta to relieve suffering across the six realms.
Passing into final parinirvana at Hyeolsa Temple in Gyeongju in 686 at the age of sixty-nine amidst extraordinary auspicious signs and deep veneration from King Sinmun of Silla and the entire Korean Sangha, Wonhyo left an immortal intellectual and spiritual legacy that defined the non-sectarian character of Korean Buddhism for over thirteen centuries. Revered as the National Preceptor Hwajaeng Guksa and profoundly inspiring Uisang, Jinul, Fazang, and Dogen, Wonhyo stands forever alongside Nagarjuna, Asanga, Xuanzang, Woncheuk, and Longchenpa as a supreme guardian of the Middle Way.