In Buddhism, people worship not only Sakyamuni Buddha but also other Buddhas, such as Amitayus (in the west) and Aksobhya (in the east). Such Buddhas have different names and attributes, and different life spans, long or short. The longest existing one is thought to have lived for several tens of kalpas. At any rate, they are all limited entities, because all of them eventually entered into Nirvana. The main point of the Lotus Sutra is that all Buddhas, by whatever names they may use, are temporary manifestations of the eternal, infinite, and immortal Sakyamuni Buddha. He transforms himself into other Buddhas when necessary to redeem and guide people, who understand him in various ways according to their particular times, places, and levels of culture.