The Contingency Argument for God

Many consider the argument for God from contingency to be one of the strongest. The basic form is simple:

1. If something exists, there must exist what it takes for that thing to exist.
2. The universe—the collection of beings in space and time—exists.
3. Therefore, there must exist what it takes for the universe to exist.
4. What it takes for the universe to exist cannot exist within the universe or be bounded by space and time.
5. Therefore, what it takes for the universe to exist must transcend both space and time.

Suppose you deny the first premise. Then if X exists, there need not exist what it takes for X to exist. But "what it takes for X to exist" means the immediate condition(s) for X's existence. You mean that X exists only if Y. Without Y, there can be no X. So the denial of premise 1 amounts to this: X exists; X can only exist if Y exists; and Y does not exist. This is absurd. So there must exist what it takes for the universe to exist. But what does it take?

We spoke of the universe as "the collection of beings in space and time." Consider one such being: yourself. You exist, and you are, in part at least, material. This means that you are a finite, limited and changing being, you know that right now, as you read this book, you are dependent for your existence on beings outside you. Not your parents or grandparents. They may no longer be alive, but you exist now. And right now you depend on many things in order to exist—for example, on the air you breathe. To be dependent in this way is to be contingent. You exist if something else right now exists.

But not everything can be like this. For then everything would need to be given being, but there would be nothing capable of giving it. There would not exist what it takes for anything to exist. So there must be something that does not exist conditionally; something which does not exist only if something else exists; something which exists in itself. What it takes for this thing to exist could only be this thing itself. Unlike changing material reality, there would be no distance, so to speak, between what this thing is and that it is. Obviously the collection of beings changing in space and time cannot be such a thing. Therefore, what it takes for the universe to exist cannot be identical with the universe itself or with a part of the universe.

Question: But why should we call this cause "God"? Maybe there is something unknown that grounds the universe of change we live in.

Reply: True. And this "unknown" is God. What we humans know directly is this sensible changing world. We also know that there must exist whatever it takes for something to exist. Therefore, we know that neither this changing universe as a whole nor any part of it can be itself what it takes for the universe to exist. But we have now such direct knowledge of the cause of changing things. We know that there must exist a cause; we know that this cause cannot be finite or material—that it must transcend such limitations. But what this ultimate cause is in itself remains, so far, a mystery.

There is more to be said by reason; and there is very much more God has made known about himself through revelation. But the proofs have given us some real knowledge as well: knowledge that the universe is created; knowledge that right now it is kept in being by a cause unbounded by any material limit, that transcends the kind of being we humans directly know. And that is surely knowledge worth having. We might figure out that someone's death was murder and no accident, without figuring out exactly who did it and why, and this might leave us frustrated and unsatisfied. But at least we would know what path of questioning to pursue; at least we would know that someone did it.

So it is with the proofs. They let us know that at every moment the being of the universe is the creative act of a Giver—a Giver transcending all material and spiritual limitations. Beyond that, they do not tell us much about what or who this Giver is—but they point in a very definite direction. We know that this Ultimate Reality—the Giver of being—cannot be material. And we know the gift which is given includes personal being: intelligence, will and spirit. The infinite transcendent cause of these things cannot be less than they are, but must be infinitely more. How and in what way we do not know. To some extent this Giver must always remain unknown to human reason. We should never expect otherwise. But reason can at least let us know that "someone did it." And that is of great value.

 
 
Excerpted from “Handbook of Catholic Apologetics", copyright 1994, Peter Kreeft and Ronald Tacelli, published 2009 Ignatius Press, used with permission of the publisher. Text reproduced from PeterKreeft.com.

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