In Buddhism, dukkha is one of the three marks of existence, along with impermanence and anattā (non-self). Buddhism, like other major Indian religions, asserts that everything is impermanent (anicca), but, unlike them, also asserts that there is no permanent self or soul in living beings ("anattā").[b , Quote: "(...) Buddha's teaching that beings have no soul, no abiding essence. This 'no-soul doctrine' (anatta-vada) he expounded in his second sermon."</ref> The ignorance or misperception ("avijjā") that anything is permanent or that there is self in any being is considered a wrong understanding, and the primary source of clinging and dukkha.