Thursday, June 2, 2011

Arguments for God's Existence

Arguments for God's Existence

Can You Prove God Exists?
Argument from Design
Argument from First Cause
Argument from Conscience
Argument from History
Argument from Pascal's Wager
Argument from Desire

Source: http://www.peterkreeft.com/featured-writing.htm

Argument from Design


The argument starts with the major premise that where there is design, there must be a designer. The minor premise is the existence of design throughout the universe. The conclusion is that there must be a universal designer.

Why must we believe the major premise, that all design implies a designer? Because everyone admits this principle in practice. For instance, suppose you came upon a deserted island and found "S.O.S." written in the sand on the beach. You would not think the wind or the waves had written it by mere chance but that someone had been there, someone intelligent enough to design and write the message. If you found a stone hut on the island with windows, doors, and a fireplace, you would not think a hurricane had piled up the stones that way by chance. You immediately infer a designer when you see design.

When the first moon rocket took off from Cape Canaveral, two U.S. scientists stood watching it, side by side. One was a believer, the other an unbeliever. The believer said, "Isn't it wonderful that our rocket is going to hit the moon by chance?" The unbeliever objected, "What do you mean, chance? We put millions of manhours of design into that rocket." "Oh," said the believer, "you don't think chance is a good explanation for the rocket? Then why do you think it's a good explanation for the universe? There's much more design in a universe than in a rocket. We can design a rocket, but we couldn't design a whole universe. I wonder who can?" Later that day the two were strolling down a street and passed an antique store. The atheist admired a picture in the window and asked, "I wonder who painted that picture?" "No one," joked the believer; "it just happened by chance."

Is it possible that design happens by chance without a designer? There is perhaps one chance in a trillion that "S.O.S." could be written in the sand by the wind. But who would use a one-in-a-trillion explanation? Someone once said that if you sat a million monkeys at a million typewriters for a million years, one of them would eventually type out all of Hamlet by chance. But when we find the text of Hamlet, we don't wonder whether it came from chance and monkeys. Why then does the atheist use that incredibly improbable explanation for the universe? Clearly, because it is his only chance of remaining an atheist. At this point we need a psychological explanation of the atheist rather than a logical explanation of the universe. We have a logical explanation of the universe, but the atheist does not like it. It's called God.

There is one especially strong version of the argument from design that hits close to home because it's about the design of the very thing we use to think about design: our brains. The human brain is the most complex piece of design in the known universe. In many ways it is like a computer. Now just suppose there were a computer that was programmed only by chance. For instance, suppose you were in a plane and the public-address system announced that there was no pilot, but the plane was being flown by a computer that had been programmed by a random fall of hailstones on its keyboard or by a baseball player in spiked shoes dancing on computer cards. How much confidence would you have in that plane? But if our brain computer has no cosmic intelligence behind the heredity and environment that program it, why should we trust it when it tells us about anything, even about the brain?

You can't get more in the effect than you had
in the cause.

Another specially strong aspect of the design argument is the so-called anthropic principle, according to which the universe seems to have been specially designed from the beginning for human life to evolve. If the temperature of the primal fireball that resulted from the Big Bang some fifteen to twenty billion years ago, which was the beginning of our universe, had been a trillionth of a degree colder or hotter, the carbon molecule that is the foundation of all organic life could never have developed. The number of possible universes is trillions of trillions; only one of them could support human life: this one. Sounds suspiciously like a plot. If the cosmic rays had bombarded the primordial slime at a slightly different angle or time or intensity, the hemoglobin molecule, necessary for all warm-blooded animals, could never have evolved. The chance of this molecule's evolving is something like one in a trillion trillion. Add together each of the chances and you have something far more unbelievable than a million monkeys writing Hamlet.

There are relatively few atheists among neurologists and brain surgeons and among astrophysicists, but many among psychologists, sociologists, and historians. The reason seems obvious: the first study divine design, the second study human undesign.

But doesn't evolution explain everything without a divine Designer? Just the opposite; evolution is a beautiful example of design, a great clue to God. There is very good scientific evidence for the evolving, ordered appearance of species, from simple to complex. But there is no scientific proof of natural selection as the mechanism of evolution, Natural selection "explains" the emergence of higher forms without intelligent design by the survival-of-the-fittest principle. But this is sheer theory. There is no evidence that abstract, theoretical thinking or altruistic love make it easier for man to survive. How did they evolve then?

Furthermore, could the design that obviously now exists in man and in the human brain come from something with less or no design? Such an explanation violates the principle of causality, which states that you can't get more in the effect than you had in the cause. If there is intelligence in the effect (man), there must be intelligence in the cause. But a universe ruled by blind chance has no intelligence. Therefore there must be a cause for human intelligence that transcends the universe: a mind behind the physical universe. (Most great scientists have believed in such a mind, by the way, even those who did not accept any revealed religion.)

How much does this argument prove? Not all that the Christian means by God, of course—no argument can do that. But it proves a pretty thick slice of God: some designing intelligence great enough to account for all the design in the universe and the human mind. If that's not God, what is it? Steven Spielberg?


The First Cause Argument


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.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.

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.

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.

Here is one more analogy. Suppose I tell you there is a book that explains everything you want explained. You want that book very much. You ask me whether I have it. I say no, I have to get it from my wife. Does she have it? No, she has to get it from a neighbor. Does he have it? No, he has to get it from his teacher, who has to get it. . . et cetera, etcetera, ad infinitum. No one actually has the book. In that case, you will never get it. However long or short the chain of book borrowers may be, you will get the book only if someone actually has it and does not have to borrow it. Well, existence is like that book. Existence is handed down the chain of causes, from cause to effect. If there is no first cause, no being who is eternal and self-sufficient, no being who has existence by his own nature and does not have to borrow it from someone else, then the gift of existence can never be passed down the chain to others, and no one will ever get it. But we did get it. We exist. We got the gift of existence from our causes, down the chain, and so did every actual being in the universe, from atoms to archangels. Therefore there must be a first cause of existence, a God.

If there is no independent being, then the whole chain of dependent beings is dependent on nothing and could not exist.

In more abstract philosophical language, the proof goes this way. Every being that exists either exists by itself, by its own essence or nature, or it does not exist by itself. If it exists by its own essence, then it exists necessarily and eternally, and explains itself. It cannot not exist, as a triangle cannot not have three sides. If, on the other hand, a being exists but not by its own essence, then it needs a cause, a reason outside itself for its existence. Because it does not explain itself, something else must explain it. Beings whose essence does not contain the reason for their existence, beings that need causes, are called contingent, or dependent, beings. A being whose essence is to exist is called a necessary being. The universe contains only contingent beings. God would be the only necessary being—if God existed. Does he? Does a necessary being exist? Here is the proof that it does. Dependent beings cannot cause themselves. They are dependent on their causes. If there is no independent being, then the whole chain of dependent beings is dependent on nothing and could not exist. But they do exist. Therefore there is an independent being.

Saint Thomas has four versions of this basic argument.

First, he argues that the chain of movers must have a first mover because nothing can move itself. (Moving here refers to any kind of change, not just change of place.) If the whole chain of moving things had no first mover, it could not now be moving, as it is. If there were an infinite regress of movers with no first mover, no motion could ever begin, and if it never began, it could not go on and exist now. But it does go on, it does exist now. Therefore it began, and therefore there is a first mover.
Second, he expands the proof from proving a cause of motion to proving a cause of existence, or efficient cause. He argues that if there were no first efficient cause, or cause of the universe's coming into being, then there could be no second causes because second causes (i.e., caused causes) are dependent on (i.e., caused by) a first cause (i.e., an uncaused cause). But there are second causes all around us. Therefore there must be a first cause.
Third, he argues that if there were no eternal, necessary, and immortal being, if everything had a possibility of not being, of ceasing to be, then eventually this possibility of ceasing to be would be realized for everything. In other words, if everything could die, then, given infinite time, everything would eventually die. But in that case nothing could start up again. We would have universal death, for a being that has ceased to exist cannot cause itself or anything else to begin to exist again. And if there is no God, then there must have been infinite time, the universe must have been here always, with no beginning, no first cause. But this universal death has not happened; things do exist! Therefore there must be a necessary being that cannot not be, cannot possibly cease to be. That is a description of God.
Fourth, there must also be a first cause of perfection or goodness or value. We rank things as more or less perfect or good or valuable. Unless this ranking is false and meaningless, unless souls don't really have any more perfection than slugs, there must be a real standard of perfection to make such a hierarchy possible, for a thing is ranked higher on the hierarchy of perfection only insofar as it is closer to the standard, the ideal, the most perfect. Unless there is a most-perfect being to be that real standard of perfection, all our value judgments are meaningless and impossible. Such a most-perfect being, or real ideal standard of perfection, is another description of God.

There is a single common logical structure to all four proofs. Instead of proving God directly, they prove him indirectly, by refuting atheism. Either there is a first cause or not. The proofs look at "not" and refute it, leaving the only other possibility, that God is.

Each of the four ways makes the same point for four different kinds of cause: first, cause of motion; second, cause of a beginning to existence; third, cause of present existence; and fourth, cause of goodness or value. The common point is that if there were no first cause, there could be no second causes, and there are second causes (moved movers, caused causers, dependent and mortal beings, and less-than-wholly-perfect beings). Therefore there must be a first cause of motion, beginning, existence, and perfection.

How can anyone squirm out of this tight logic? Here are four ways in which different philosophers try.

First, many say the proofs don't prove God but only some vague first cause or other. "God of Abraham, Isaac, and Jacob, not the God of philosophers and scholars", cries Pascal, who was a passionate Christian but did not believe you could logically prove God's existence. It is true that the proofs do not prove everything the Christian means by God, but they do prove a transcendent, eternal, uncaused, immortal, self-existing, independent, all-perfect being. That certainly sounds more like God than like Superman! It's a pretty thick slice of God, at any rate—much too much for any atheist to digest.
Second, some philosophers, like Hume, say that the concept of cause is ambiguous and not applicable beyond the physical universe to God. How dare we use the same term for what clouds do to rain, what parents do to children, what authors do to books, and what God does to the universe? The answer is that the concept of cause is analogical—that is, it differs somewhat but not completely from one example to another. Human fatherhood is like divine fatherhood, and physical causality is like divine causality. The way an author conceives a book in his mind is not exactly the same as the way a woman conceives a baby in her body either, but we call both causes. (In fact, we also call both conceptions.) The objection is right to point out that we do not fully understand how God causes the universe, as we understand how parents cause children or clouds cause rain. But the term remains meaningful. A cause is the sine qua non for an effect: if no cause, no effect. If no creator, no creation; if no God, no universe.
Third, it is sometimes argued (e.g., by Bertrand Russell) that there is a self-contradiction in the argument, for one of the premises is that everything needs a cause, but the conclusion is that there is something (God) which does not need a cause. The child who asks "Who made God?" is really thinking of this objection. The answer is very simple: the argument does not use the premise that everything needs a cause. Everything in motion needs a cause, everything dependent needs a cause, everything imperfect needs a cause.
Fourth, it is often asked why there can't be infinite regress, with no first being. Infinite regress is perfectly acceptable in mathematics: negative numbers go on to infinity just as positive numbers do. So why can't time be like the number series, with no highest number either negatively (no first in the past) or positively (no last in the future)? The answer is that real beings are not like numbers: they need causes, for the chain of real beings moves in one direction only, from past to future, and the future is caused by the past. Positive numbers are not caused by negative numbers. There is, in fact, a parallel in the number series for a first cause: the number one. If there were no first positive integer, no unit one, there could be no subsequent addition of units. Two is two ones, three is three ones, and so on. If there were no first, there could be no second or third.

If this argument is getting too tricky, the thing to do is to return to what is sure and clear: the intuitive point we began with. Not everyone can understand all the abstract details of the first-cause argument, but anyone can understand its basic point: as C. S. Lewis put it, "I felt in my bones that this universe does not explain itself."

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