In early Buddhism and in Theravada Buddhism, an arhat (literally meaning "worthy") is someone who reached the same awakening ("bodhi") of a Buddha by following the teaching of a Buddha. They are seen as having ended rebirth and all the mental defilements. A bodhisattva ("a being bound for awakening") meanwhile, is simply a name for someone who is working towards awakening ("bodhi") as a Buddha. According to all the early buddhist schools as well as Theravada, to be considered a bodhisattva one has to have made a vow in front of a living Buddha and also has to have received a confirmation of one's future Buddhahood. In Theravada, the future Buddha is called Metteyya (Maitreya) and he is revered as a bodhisatta currently working for future Buddhahood.