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Note: begin wikification here. Warning! The following has not yet been wikified, and therefore has not yet been rendered from the neutral point of view! (It is part of a college lecture; see .) --
The Abrahamic faiths, Judaism, Christianity, and Islam, all affirm theism, or belief in God. These religions each give different answers as to the details, and those details are very important to the adherents of these religions; but together they share a tradition of asking the same or similar questions, and proposing the same or similar answers, about what, precisely, God is or is supposed to be.
Upon being asked what God is, it is natural for some to answer: "I don't know--no one knows. And that's as it should be. God is totally beyond the comprehension of mere finite beings such as ourselves, and we should not go about pretending that we can know what God is." There is something paradoxical about this position, namely, if one believes that the nature of God is totally unknown, but one nevertheless says that one believes that God exists, then one cannot even say what it is that one is believing in. Suppose someone tells you, "I believe that flibits exist, but I have absolutely no idea of what flibits are." This appears to be only so much nonsense. But surely believers do not want to say that their talk of God is nonsense. At least some minimal conception, therefore, seems required.
Even mystics, who believe that the nature of God is essentially mysterious to human beings, concede that one must have at least a minimal conception of God. If one has anything like a traditional Jewish or Christian belief, for example then in fact one does have some conception of what God is: God is an eternally existent spiritual being who created the world, and so forth. Many Christians further affirm: "There is the Father, Son, and Holy Spirit, so that there are three aspects to God, and while we may not know the precise meaning of this doctrine (of the Trinity), nonetheless we can know that it is true."
Philosophers know all too well, from dealing with for example the problem of substanceMetaphysics One of the more vexed topics of metaphysics and ontology concerns what might be called objects, or objecthood: what general claims can we make about the meaning of talk of objects bodies such as rocks, trees, as well as (arguably) minds? The l and the problem of universalsThe problem of universals is a conventional term given to what is in fact a nest of intertwined problems, some within the domain of cognitive psychology, others within that of epistemology, still others within ontology. In other words, this problem involv, that general "What is" questions ( ti esti questions ) give an overly simple appearance to what is in fact a very complex affair. The situation is no different with the question, "What is God?" What is it exactly that we are asking when we ask this? If all we wanted were a definition of "God," there are many of those available. What else is needed?
It is one thing to give the traditional sort of definition of "God," but it is quite another really to understand the terms used in the definition.
What follows is a typical definition of "God," which, perhaps with some adjustments, would be acceptable to many within the Jewish, Christian, and Muslim faiths:
Several aspects of this definition appear, to many thinkers, to need some explanation. There are two different kinds of questions we might raise about aspects of the definition. First, what do various important terms in the definition really mean? Second, how could we possibly get the very concepts of certain properties, described by those terms, properties which are not properties of anything in our ordinary everyday experience? What follows is a limited sample of problems. We begin by examining two relatively minor problems and then one much more important, overarching problem.
First, some say that God is eternally existent. Some theorists take this to mean that God is timeless--categories of past, present, and future just do not apply when we are talking about God. Others hold, instead, that "eternal existence" means that God exists at all times. In other words, if God is eternally existent, he has already existed for an infinite amount of time, and he will continue to exist for an infinite amount of time--his existence never began and will never end. (See eternal existence.)
It is common to deny that we can understand God's eternity. Suppose we wish to deny that we can understand what an actual infinity is, and therefore we cannot understand what (God's) eternity is. In that case, part of what God is--his eternity--is something we cannot understand. Nevertheless, we want to have some notion of what God is that is adequate or robust enough for us to be able to say we understand what we mean when we say that God exists. The mere fact, if it is a fact, that we do not understand eternal existence, may not, by itself, be enough to show that we do not know what we are talking about when we say that God exists. Maybe we could still make sense of the claim, "God exists," without any clear notion of eternal existence, or maybe we could make do by understanding God's eternity by way of our closely related concept, of a potential infinity.
Second, we say that God is "all-powerful," or to say the same thing, omnipotent (see omnipotence). Some philosophers have brought up some puzzles that are supposed to cast some doubt on whether the notion of omnipotence is coherent, or that are supposed to force us to rethink our notion of what omnipotence might be, anyway. The basic notion of being all-powerful can be understood well enough, it seems, at first glance: something is omnipotent, or all-powerful, if the being can do anything we can think of. But here is something we seem to be able to think of: a square circle . We may not be able to imagine a square circle, and of course, such a notion is self-contradictory . For all that, we do know what a square circle would be: a shape that is both square and circular. One might argue, then, as follows: if God can do anything, then he could create an actual square circle. But square circles, being self-contradictory, cannot exist. Does this mean that it is in God's capacity to do impossible things?
Along the same lines there is this hackneyed conundrum: would God's omnipotence allow him to create a stone that he could not lift? On the one hand, he is omnipotent, so he could create anything; but if he created this stone, then he could not lift it. It does not seem to solve the problem to say that, just as a matter of fact, God does not make square circles, or stones he cannot lift. The question, after all, is not whether God does such things, but whether he could do such things. The claim that God is omnipotent is, after all, a claim about what is possible, about what God has the ability to do, not about what is actual.
Many philosophers and theologians regard this puzzle about omnipotence as not a very serious problem. What they often say is that God can do whatever is logically possible. God cannot create contradictions, they say, but that is no real limitation of God's power. To talk about an actually existent contradiction is just nonsense, they claim; that God cannot create a stone he cannot lift, or that God cannot create an actually existent square circle, is not any serious limitation of God's power. So, they say, we could say that God can do anything that does not imply a contradiction.