Korean woodblock book, printed during the 16th century. The text of the Sutra of Filial Piety was composed in China and does not form part of the original Buddhist canon compiled in India. The earliest known version of this sutra was discovered at Dunhuang. Though Buddhist, the Sutra incorporates the Confucian ethic of repaying the kindness and devotion of one's parents through acts of self-abasement and became very popular in Korea. This Korean version contains illustrations of various acts of filial piety accompanied by the original text in Chinese characters and an explanation in Korean hangŭl script.