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In East Asian Buddhism, Shakyamuni Buddha of the Essential Teachings of the Lotus Sutra is considered the eternal Buddha. In the sixteenth chapter of the Lotus Sutra, Shakyamuni Buddha reveals that he actually attained Buddhahood in the inconceivably remote past. The Eternal Buddha is contrasted to Shakyamuni Buddha who attained enlightenment for the first time in India, which was taught in the pre-Lotus Sutra teachings.
The belief in the Eternal Buddha transcends through time and is commonly associated with Shakyamuni Buddha, but can also refer to both his past and future incarnations. However, no exact definition of the Eternal Buddha is defined in the Lotus Sutra, which was also revealed by Siddhartha Gautama; thereby making open interpretations to various religious groups.