In Theravada Buddhism, a Buddha is someone who has become awake through their own efforts and insight. They have put an end to their cycle of rebirths and have ended all unwholesome mental states which lead to bad action and thus are morally perfected. While subject to the limitations of the human body in certain ways (for example, in the early texts, the Buddha suffers from backaches), a Buddha is said to be "deep, immeasurable, hard-to-fathom as is the great ocean," and also has immense psychic powers (abhijñā).