The Lotus Sūtra, the Saddharmapuṇḍarīka, teaches that the three vehicles are skilful means within the one vehicle of buddhahood, illustrated with parables such as the burning house. It reveals the Buddha as having awakened in the immeasurable past. It is the central scripture of Tiantai and of the Nichiren traditions.
Lotus Sūtra
A Mahāyāna sūtra teaching that all paths lead to buddhahood and that the Buddha’s life is eternal.
Also: Lotus Sutra, Saddharma Pundarika