The 'three parts of the Lotus Sutra;' The three principal sutras of the Tiantai 天台 and Nichiren 日莲 sects. They are the Wuliangyi jing 无量义经 （T 276）， which serves as an introduction to the Lotus Sutra， the Lotus Sutra （Fahua jing） 法华经 itself （T 262）， which is the main discourse of the teaching; and the Puxianguan jing 普贤观经 （T 277）， which serves as the conclusion to the teaching.