The First Cause Argument
S E E D E D C O N T E N T
The First Cause Argument
The most famous of all arguments for the existence of God are the "five ways" of Saint Thomas Aquinas. One of the five ways, the fifth, is the argument from design, which we looked at in the last essay. The other four are versions of the first-cause argument, which we explore here.
The argument is basically very simple, natural, intuitive, and commonsensical. We have to become complex and clever in order to doubt or dispute it. It is based on an instinct of mind that we all share: the instinct that says everything needs an explanation. Nothing just is without a reason why it is. Everything that is has some adequate or sufficient reason why it is.
Philosophers call this the Principle of Sufficient Reason. We use it every day, in common sense and in science as well as in philosophy and theology. If we saw a rabbit suddenly appear on an empty table, we would not blandly say, "Hi, rabbit. You came from nowhere, didn't you?" No, we would look for a cause, assuming there has to be one. Did the rabbit fall from the ceiling? Did a magician put it there when we weren't looking? If there seems to be no physical cause, we look for a psychological cause: perhaps someone hypnotized us. As a last resort, we look for a supernatural cause, a miracle. But there must be some cause. We never deny the Principle of Sufficient Reason itself. No one believes the Pop Theory: that things just pop into existence for no reason at all. Perhaps we will never find the cause, but there must be a cause for everything that comes into existence.
Now the whole universe is a vast, interlocking chain of things that come into existence. Each of these things must therefore have a cause. My parents caused me, my grandparents caused them, et cetera. But it is not that simple. I would not be here without billions of causes, from the Big Bang through the cooling of the galaxies and the evolution of the protein molecule to the marriages of my ancestors. The universe is a vast and complex chain of causes. But does the universe as a whole have a cause? Is there a first cause, an uncaused cause, a transcendent cause of the whole chain of causes? If not, then there is an infinite regress of causes, with no first link in the great cosmic chain. If so, then there is an eternal, necessary, independent, self-explanatory being with nothing above it, before it, or supporting it. It would have to explain itself as well as everything else, for if it needed something else as its explanation, its reason, its cause, then it would not be the first and uncaused cause. Such a being would have to be God, of course. If we can prove there is such a first cause, we will have proved there is a God.
Why must there be a first cause? Because if there isn't, then the whole universe is unexplained, and we have violated our Principle of Sufficient Reason for everything. If there is no first cause, each particular thing in the universe is explained in the short run, or proximately, by some other thing, but nothing is explained in the long run, or ultimately, and the universe as a whole is not explained. Everyone and everything says in turn, "Don't look to me for the final explanation. I'm just an instrument. Something else caused me." If that's all there is, then we have an endless passing of the buck. God is the one who says, "The buck stops here."
If there is no first cause, then the universe is like a great chain with many links; each link is held up by the link above it, but the whole chain is held up by nothing. If there is no first cause, then the universe is like a railroad train moving without an engine. Each car's motion is explained
proximately by the motion of the car in front of it: the caboose moves because the boxcar pulls it, the boxcar moves because the cattle car pulls it, et cetera. But there is no engine to pull the first car and the whole train. That would be impossible, of course. But that is what the universe is like if there is no first cause: impossible.
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