Pratyekabuddhas are said to achieve enlightenment on their own, without the use of teachers or guides, according to some traditions by seeing and understanding dependent origination. They are said to arise only in ages where there is no Buddha and the Buddhist teachings (Sanskrit: dharma; Pāli: "dhamma") are lost. "The idea of a Paccekabuddha … is interesting, as much as it implies that even when the four truths are not preached they still exist and can be discovered by anyone who makes the necessary mental and moral effort". Many may arise at a single time.