Tag Archives: Philosophy

William Lane Craig lectures on naturalistic alternatives to the Big Bang

William Lane Craig lecturing to university students
William Lane Craig lecturing to university students

Here’s the lecture, which was given in 2004 at the University of Colorado, Boulder.

This lecture might be a little advanced for beginners, but if you stretch your mind first, you shouldn’t tear anything. (Note: standard disclaimers apply if you do tear something!)

The description of the video states:

This is quite simply one of the best lectures William Lane Craig (a philosopher of science) has given. Craig explores the origins of the universe. He argues for a beginning of the universe, while refuting scientific models like the Steady State Theory, the Oscillating Theory, Quantum Vacuum Fluctuation Model, Chaotic Inflationary Theory, Quantum Gravity Theory, String Theory, M-Theory and Cyclic Ekpyrotic Theory.

And here is the description of the lecture from Reasonable Faith:

A Templeton Foundation lecture at the University of Colorado, Boulder, laying out the case from contemporary cosmology for the beginning of the universe and its theological implications. Includes a lengthy Q & A period which features previous critics and debate opponents of Dr. Craig who were in attendance, including Michael Tooley, Victor Stenger, and Arnold Guminski.

Craig has previously debated famous atheists Stenger and Tooley previously. And they both asked him questions in the Q&A time of this lecture. Imagine – having laid out your entire case to two people who have debated you before and who know your arguments well. What did they ask Craig, and how did he respond?

The scientific evidence

The Big Bang cosmology that Dr. Craig presents is the standard model for how the universe came into being. It is a theory based on six lines of experimental evidence.

Scientific evidence:

  1. Einstein’s theory of general relativity (GTR)
  2. the red-shifting of light from distant galaxies implies an expanding universe
  3. the cosmic background radiation (which also disproves the oscillating model of the universe)
  4. the second law of thermodynamics applied to star formation theory
  5. hydrogen-helium abundance predictions
  6. radioactive element abundance predictions

It’s probably a good idea to be familiar with these if you are presenting this argument, because experimental science is a reliable way of knowing about reality.

Published research paper

This lecture by Dr. Craig is based on a research paper published in an astrophysics journal, and was delivered to an audience of students and faculty, including atheist physicist Victor Stenger and prominent atheist philosopher Michael Tooley, at the University of Colorado at Boulder.

Here’s the peer-reviewed article that the lecture is based on.

Here’s the abstract:

Both cosmology and philosophy trace their roots to the wonder felt by the ancient Greeks as they contemplated the universe. The ultimate question remains why the universe exists rather than nothing. This question led Leibniz to postulate the existence of a metaphysically necessary being, which he identified as God. Leibniz’s critics, however, disputed this identification, claiming that the space-time universe itself may be the metaphysically necessary being. The discovery during this century that the universe began to exist, however, calls into question the universe’s status as metaphysically necessary, since any necessary being must be eternal in its existence. Although various cosmogonic models claiming to avert the beginning of the universe predicted by the standard model have been and continue to be offered, no model involving an eternal universe has proved as plausible as the standard model. Unless we are to assert that the universe simply sprang into being uncaused out of nothing, we are thus led to Leibniz’s conclusion. Several objections to inferring a supernatural cause of the origin of the universe are considered and found to be unsound.

The whole text of the article is posted online here.

If you want something to post on your Twitter or Facebook that is much shorter than this lecture, then you should check out this quick 4-minute explanation of the kalam argument.

Will computers and robots ever become self-aware?

Lets take a closer look at a puzzle
Lets take a closer look at a puzzle

There is a very famous thought experiment from UC Berkeley philosopher John Searle that all Christian apologists should know about. And now everyone who reads the Wall Street Journal knows about it, because of this article.

In that article, Searle is writing about the IBM computer that was programmed to play Jeopardy. Can a robot who wins on Jeopardy be “human”? Searle says no. And his famous Chinese room example (discussed in the article) explains why.


Imagine that a person—me, for example—knows no Chinese and is locked in a room with boxes full of Chinese symbols and an instruction book written in English for manipulating the symbols. Unknown to me, the boxes are called “the database” and the instruction book is called “the program.” I am called “the computer.”

People outside the room pass in bunches of Chinese symbols that, unknown to me, are questions. I look up in the instruction book what I am supposed to do and I give back answers in Chinese symbols.

Suppose I get so good at shuffling the symbols and passing out the answers that my answers are indistinguishable from a native Chinese speaker’s. I give every indication of understanding the language despite the fact that I actually don’t understand a word of Chinese.

And if I do not, neither does any digital computer, because no computer, qua computer, has anything I do not have. It has stocks of symbols, rules for manipulating symbols, a system that allows it to rapidly transition from zeros to ones, and the ability to process inputs and outputs. That is it. There is nothing else.

Here is a link to the full article by John Searle on the Chinese room illustration.

By the way, Searle is a naturalist – not a theist, not a Christian. Now, let’s hear from a Christian scholar who can make more sense of this for us.

Here’s a related article on “strong AI” by Christian philosopher Jay Richards.


Popular discussions of AI often suggest that if you keep increasing weak AI, at some point, you’ll get strong AI. That is, if you get enough computation, you’ll eventually get consciousness.

The reasoning goes something like this: There will be a moment at which a computer will be indistinguishable from a human intelligent agent in a blind test. At that point, we will have intelligent, conscious machines.

This does not follow. A computer may pass the Turing test, but that doesn’t mean that it will actually be a self-conscious, free agent.

The point seems obvious, but we can easily be beguiled by the way we speak of computers: We talk about computers learning, making mistakes, becoming more intelligent, and so forth. We need to remember that we are speaking metaphorically.

We can also be led astray by unexamined metaphysical assumptions. If we’re just computers made of meat, and we happened to become conscious at some point, what’s to stop computers from doing the same? That makes sense if you accept the premise—as many AI researchers do. If you don’t accept the premise, though, you don’t have to accept the conclusion.

In fact, there’s no good reason to assume that consciousness and agency emerge by accident at some threshold of speed and computational power in computers. We know by introspection that we are conscious, free beings—though we really don’t know how this works. So we naturally attribute consciousness to other humans. We also know generally what’s going on inside a computer, since we build them, and it has nothing to do with consciousness. It’s quite likely that consciousness is qualitatively different from the type of computation that we have developed in computers (as the “Chinese Room” argument, by philosopher John Searle, seems to show). Remember that, and you’ll suffer less anxiety as computers become more powerful.

Even if computer technology provides accelerating returns for the foreseeable future, it doesn’t follow that we’ll be replacing ourselves anytime soon. AI enthusiasts often make highly simplistic assumptions about human nature and biology. Rather than marveling at the ways in which computation illuminates our understanding of the microscopic biological world, many treat biological systems as nothing but clunky, soon-to-be-obsolete conglomerations of hardware and software. Fanciful speculations about uploading ourselves onto the Internet and transcending our biology rest on these simplistic assumptions. This is a common philosophical blind spot in the AI community, but it’s not a danger of AI research itself, which primarily involves programming and computers.

AI researchers often mix topics from different disciplines—biology, physics, computer science, robotics—and this causes critics to do the same. For instance, many critics worry that AI research leads inevitably to tampering with human nature. But different types of research raise different concerns. There are serious ethical questions when we’re dealing with human cloning and research that destroys human embryos. But AI research in itself does not raise these concerns. It normally involves computers, machines, and programming. While all technology raises ethical issues, we should be less worried about AI research—which has many benign applications—than research that treats human life as a means rather than an end.

When I am playing a game on the computer, I know exactly why what I am doing is fun – I am conscious of it. But the computer has no idea what I am doing. It is just matter in motion, acting on it’s programming and the inputs I supply to it. And that’s all computers will ever do. Trust me, this is my field. I have the BS and MS in computer science, and I have studied this area. AI has applications for machine learning and search problems, but consciousness is not on the radar. You can’t get there from here.

Do moral dilemmas undermine objective moral absolutes?

One reason why some people reject the existence of objective morality is because moral absolutes can conflict.

Canadian philosopher Michael Horner to explains the problem.

He writes:

You may have been confronted with the story of the Nazi soldier coming to the door of the family who are hiding some Jewish people in their home and asking them point blankly, “Are there any Jews here?” The person telling the story then asks you, “What would you say?” or more precisely, “What should you say?”

[…]I think for many people the term moral absolutes connotes ideas like inflexibility and rigidity, and that there can never be exemptions. I have also found that many people believe that holding to moral absolutes means that circumstances are not relevant in a moral evaluation and that moral absolutism cannot handle moral dilemmas. But in fact it is possible to believe in moral absolutes, or as I prefer to call them objective moral values, without adhering to these connotations I have mentioned.

For many people to believe in moral absolutes is to believe in rules that no other rules can ever trump. It follows from this that moral absolutes are all equal and there can never be any exemptions. But what if moral absolutes exist in a hierarchy?

We know from experience that very often more than one moral rule applies to a situation. This often leads to moral dilemmas. So in the ‘hiding the Jews example’ the moral rule of telling the truth seems to apply to the situation, but it would seem that the moral rule to protect innocent human life from torture and murder applies also.

If absolutes are all equal there is no way out of the dilemma. You can’t choose one absolute over another because in doing so you would be violating at least one absolute which, in their view, is supposed to be inviolable.

So, in this case, it seems as if the moral absolutist is stuck in a dilemma. If you lie to save the innocent life, then that would be wrong. But if you tell the truth and hand the innocent person over to murderers, then that would be wrong. Does this really disprove objective moral absolutes?

This problem annoys me, because I know this is the kind of objection to objective morality that annoying philosophy lecturers like to push onto freshmen in order to convince them that morality is nonsense.  But does the moral dilemma objection really work?

More Horner:

[…][I]f moral absolutes exist in a hierarchy and the circumstances or the situation were relevant in determining which absolute takes precedent, then there may be a solution to the moral dilemma. That is exactly what I think is the case in the example. I for one have no difficulty knowing that the morally right thing to do in that situation is to protect the life of innocent people from torture and murder rather than tell the truth to a person who has torture and murder in their plans. My moral intuitions are very clear about this.

If someone objects and says, “No, you must always tell the truth. After all it is an absolute, and absolutes by definition can never be violated,” I would point out that they are just using a different hierarchy, putting truth telling above protecting the life of innocent people from torture and murder. There is no way to avoid making a judgment like that since more than one absolute does apply to the situation. I would just ask them to think it through again, and once they see that they have to make a judgment based on some sort of hierarchy in that situation, then I think most people’s moral intuitions will affirm that protecting the lives of innocent people from torture and murder, in that situation, trumps truth telling. There is no way to avoid choosing one over the other.

But isn’t this moral relativism? After all, we are deciding what to do based on the situation! It’s relativism, isn’t it?

No, it isn’t, because there is always one right thing to do in every situation. In every situation, you always follow the weightiest moral rule. The right thing to do does not depend on your subjective state of mind. It is an objective moral duty, and it is the same for everyone, across all times and in all places. That’s what objective morality means -what is right and wrong is not determined by personal preferences or cultural conventions, which vary by time and place.

And of course, God is the ground of this hierarchy of objective moral absolutes. They existed through him before human beings even appeared, as part of his design for us, his creatures. How we ought to behave is grounded ontologically in God’s design for us.