Lotus Sutra

The Lotus Sutra or Sutra on the White Lotus of the Sublime Dharma (Sanskrit: ; 妙法蓮華經 Chinese: Miàofǎ Liánhuā Jīng; Japanese: Myōhō Renge Kyō; Korean: Myobeomnyeonhwagyeong; Vietnamese: "Diệu Pháp Liên Hoa Kinh") is one of the most popular and influential Mahāyāna sutras in East Asia and the basis on which the Nichiren sects of Buddhism were established.
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Lotus Sutra (Saddarma Pundarika) {BCW 11:345, 347, 573-4; 3:397}

The Lotus Sutra is probably the most important text of Mahayana Buddhism. It describes a lecture the Buddha gave and the ideas and thoughts. He discusses all the things that differentiate Mahayana Buddhism from Theravada , such as the idea of a bodhisattva , in particular the bodhisattva Avalokiteshvara , the merit of the people who venerate the Lotus Sutra, and the key to nirvana  and Buddhahood.