Buddhism developed out of the teachings of Siddhartha Gautama who, in 535 BCE, reached enlightenment and assumed the title Buddha. He promoted 'The Middle Way' as the path to enlightenment rather than the extremes of mortification of the flesh or hedonism. Long after his death the Buddha's teachings were written down. This collection is called the Tripitaka. Buddhists believe in reincarnation and that one must go through cycles of birth, life, and death. After many such cycles, if a person releases their attachment to desire and the self, they can attain Nirvana. In general, Buddhists do not believe in any type of God, the need for a savior, prayer, or eternal life after death. However, since the time of the Buddha, Buddhism has integrated many regional religious rituals, beliefs and customs into it as it has spread throughout Asia, so that this generalization is no longer true for all Buddhists. This has occurred with little conflict due to the philosophical nature of Buddhism.