Omnipotence is the quality of having unlimited power. Monotheistic religions generally attribute omnipotence only to the deity of their faith. In the monotheistic religious philosophy of Abrahamic religions, omnipotence is often listed as one of a deity's characteristics, along with omniscience, omnipresence, and omnibenevolence. The presence of all these properties in a single entity has given rise to considerable theological debate, prominently including the problem of evil, the question of why such a deity would permit the existence of evil. It is accepted in philosophy and science that omnipotence can never be effectively understood. The word omnipotence derives from the Latin prefix omni-, meaning "all", and the word potens, meaning "potent" or "powerful". Thus the term means "all-powerful". The term omnipotent has been used to connote a number of different positions. These positions include, but are not limited to, the following: A deity is able to do anything that it chooses to do. (In this version, God can do the impossible and something contradictory.) A deity is able to do anything that is in accord with its own nature (thus, for instance, if it is a logical consequence of a deity's nature that what it speaks is truth, then it is not able to lie). It is part of a deity's nature to be consistent and that it would be inconsistent for said deity to go against its own laws unless there was a reason to do so. Thomas Aquinas acknowledged difficulty in comprehending the deity's power: "All confess that God is omnipotent; but it seems difficult to explain in what His omnipotence precisely consists: for there may be doubt as to the precise meaning of the word 'all' when we say that God can do all things. If, however, we consider the matter aright, since power is said in reference to possible things, this phrase, 'God can do all things,' is rightly understood to mean that God can do all things that are possible; and for this reason He is said to be omnipotent.