The soul in many religions, philosophical and mythological traditions, is the incorporeal and immortal essence of a living being. According to Abrahamic religions, only human beings have immortal souls. For example, the Catholic theologian Thomas Aquinas attributed "soul" () to all organisms but argued that only human souls are immortal. Other religions (most notably Jainism and Hinduism) teach that all biological organisms have souls, while some teach that even non-biological entities (such as rivers and mountains) possess souls. This latter belief is called animism.