'Single vehicle' （eka-ya^na）. A term used to indicate the doctrine that there is only one teaching， which is the expedient means to attract people to the Single Buddha vehicle. Since this single vehicle teaching is the teaching of becoming a Buddha， it is also called the 'bodhisattva vehicle' 菩萨乘， the 'Buddha vehicle' 佛乘 and the Great Vehicle 大乘. The Faxiang 法相 school interprets this bodhisattva vehicle of the three vehicle 三乘 system as the 'one vehicle' or 'buddha vehicle.' According to Kuiji's 窥基 explanation， the ekaya^na teaching of the Faxiang school has two levels， 摄入大乘 and 出生大乘. The former is the expedient to attract people of undermined nature （不定性） to the Single Buddha vehicle. Because of the existence of sentient beings incapable of Buddhahood， this teaching does not fully correspond with the meaning of single vehicle. But since all members of the audience in the Lotus Sutra 法华经 have the potential to become Buddha， this teaching is true and effective in that situation. The latter means that all teachings of Buddha are 'born' from a single Maha^ya^na teaching. Kuiji says that this is the teaching of the S/ri^ma^la^-su^tra 胜鬘经 and the Nirvana Sutra 涅槃经. In Huayan 华严 and Tiantai 天台， there is a distinction between this one Buddha vehicle and the bodhisattva vehicle of the three vehicles.