We’re using the book “Handbook of Apologetics” by Peter Kreeft and Ronald Tacelli to go over the arguments for the existence of God. Dr. Kreeft teaches logic in two major universities, so his arguments tend to be clear, concise and very helpful.
This week we’ll be going over the argument from contingency:
7. The Argument from Contingency
The basic form of this argument 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, for matter is a principle of limitation and change. Because you are limited and changing, 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.
Kreeft, P., & Tacelli, R. K. (1994). Handbook of Christian apologetics: hundreds of answers to crucial questions (p. 61). Downers Grove, IL: InterVarsity Press.