A deity or god is a supernatural being considered to have authority over some aspect of the universe and/or life, with many also being considered as sacred and worthy of worship. It is "a spirit or being believed to have created, or to control some part of the universe or life, for which such a deity is often worshipped". The Oxford Dictionary of English explains deity as being a god or goddess, or anything revered as divine. While, C. Scott Littleton defines a deity as "a being with powers greater than those of ordinary humans, but who interacts with humans, positively or negatively, in ways that carry humans to new levels of consciousness, beyond the grounded preoccupations of ordinary life". Belief in the existence of at least one deity, who may interact with the world, is called theism.