 Although Aquinas was a Catholic and not a deist, the concept of the "idle god" refers to a deity whose existence is not readily knowable by humans solely through contemplation or through the examination of divine actions.The concept of "deus otiosus" often suggests a god who has grown weary from involvement in this world and who has been replaced by younger, more active gods, whereas "deus absconditus" suggests a god who has consciously left this world to hide elsewhere.In Vaiśeṣika school of Hinduism, early theories were atheistic / non-theistic, with universe explained as composed of eternal "paramanu" (atoms) of substances whose combinations and interactions explained the nature of universe.