Tag Archives: Apologetics

What you need to know: videos about the Borde-Guth-Vilenkin theorem (BGV theorem)

11/04/2011 Wintery Knight 4 Comments

Did you all read my summary of the excellent debate between William Lane Craig and Peter Millican? That was probably the best debate I have seen in since 2005. Millican knew all about Craig’s argument from the Big Bang cosmology and he proposed a dozen challenges to Craig’s premises. But Craig was able to establish the beginning of the universe by appealing to something called the Borde-Guth-Vilenkin theorem. This theorem is new – but it is worth learning about.

First, let’s review Craig’s cosmological argument:

A1) The origin of the universe

The universe began to exist.

If the universe began to exist, then the universe has a transcendent cause.

The universe has a transcendent cause.

The origin of the universe is confirmed by philosophical arguments and scientific evidence.

There cannot be an actual infinite number of past events, because mathematical operations like subtraction and division cannot be applied to actual infinities.

The Borde-Guth-Vilenkin (BGV) proof shows that every universe that expands must have a space-time boundary in the past. That means that no expanding universe, no matter what the model, cannot be eternal into the past.

Even speculative alternative cosmologies do not escape the need for a beginning.

The cause of the universe must be transcendent and supernatural. It must be uncaused, because there cannot be an infinite regress of causes. It must be eternal, because it created time. It must be non-physical, because it created space. There are only two possibilities for such a cause. It could be an abstract object or an agent. Abstract objects cannot cause effects. Therefore, the cause is an agent.

So he appealed to the Bord-Guth-Vilenkin theorem right from the start in order to guarantee a space-time boundary in the past – i.e., a beginning of the universe, which is his premise 1.

Ok, now let’s take a look at the videos.

The Borde-Guth-Vilenkin theorem, explained

Part 1:

Part 2:

Millican tried to argue that there was a way to get a beginning in an eternal universe if the universe was contracting. I’m guessing he means that the new universe would begin to exist within some outside hyper-universe.

But Craig had a response:

Further study

If you would like to read a nice LONG article about Craig’s cosmological argument, just check this post I wrote a while back. And it even contains a nice peer-reviewed paper that Craig wrote for an Astrophysics journal – and the abstract is online on Springer! Now put your Evil Hat on and think with me – think of the fun you could have by sending that paper to all your atheist friends. Send them the abstract on Springer, and send them the full text of the article. Then send them the link to my summary of the Craig-Millican debate which has the audio. If that doesn’t rehabiliate God’s reputation and honor in their eyes, then nothing will. At the very least, they should be ready to accept that atheism is not as well supported by science, which is exactly the way that God intended things to be.

What does the Bible say in Psalm 19:1-6:

¹ The heavens declare the glory of God;
the skies proclaim the work of his hands.
² Day after day they pour forth speech;
night after night they reveal knowledge.
³ They have no speech, they use no words;
no sound is heard from them.
⁴ Yet their voice^[b] goes out into all the earth,
their words to the ends of the world.
In the heavens God has pitched a tent for the sun.
⁵ It is like a bridegroom coming out of his chamber,
like a champion rejoicing to run his course.
⁶ It rises at one end of the heavens
and makes its circuit to the other;
nothing is deprived of its warmth.

And in Romans 1:20:

²⁰ For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse.

And in Hebrews 11:3:

³ By faith we understand that the universe was formed at God’s command, so that what is seen was not made out of what was visible.

Indeed. And it’s our job to make his glory know to the unbeliever – using good science.

Commentary

Women and apologetics: heads for men and hearts for women?

11/01/2011 Wintery Knight Leave a comment

Here’s an interesting essay about women and apologetics posted by Mary from South Africa.

Here’s her thesis:

If you like to potter around apologetics blogs on the internet (my guess, if you’re reading this, is that you do), or if you attend apologetics events, you’ll notice that the ratio of men to women is skewed somewhat towards there being a lot more men involved in such things than women.

Now before anyone thinks this is going to be a feminist diatribe about glass ceilings and male domination, hear me out. I have no problem with there being plenty of men in apologetics. I want every Christian I can get to take an interest in apologetics – male or female. Moreover, I’m a pretty traditional Christian woman who believes in male leadership in the home and church, so a radical feminist agenda is most definitely not my aim. My aim is not to discourage men from taking part in apologetics, or to advocate for any artificially imposed gender balance, but to encourage more women to get involved in apologetics.

To do that, we need to consider why this imbalance exists to the degree that it does.

And here’s a sample:

It may well be that there will still be fewer women taking part in debates because of women’s avoidance of emotionally upsetting situations. However, if a woman feels she can deal with such situations, all strength to her! Particularly when radical feminism lashes out at the Christian worldview as it applies to women there is a real opportunity for women to demonstrate that they can be strong in the way God intended without having to compromise their commitment to Christ or His plan for women.

Organized debates are also not the only platform to exercise apologetics. We’re not all able to be William Lane Craig, but we are all able to “(a)lways be prepared to give an answer to everyone who asks [us] to give the reason for the hope that [we] have” (1 Peter 3:15). Moreover, Peter goes on to make clear that this should be done “with gentleness and respect, keeping a clear conscience, so that those who speak maliciously against [our] good behaviour in Christ may be ashamed of their slander”. This is quite the opposite of cold and being hard. Yes, it is always a challenge (for men and for women) to be gentle and respectful while being uncompromising on the truth. But it’s certainly not a cold, unfeminine way to do things.

In fact, women’s greater tendency to connect with and express their emotions may actually help them to keep Peter’s suggested manner of apologetic practice in mind. It may also help them to strike up one-to-one connections with others which lead very naturally to discussions in which apologetics are useful in presenting the Christian faith.

Within the family too, every Christian wife and mother can play a vital role by using apologetics to encourage and support her husband and to instruct and bring up her children with a good, solid basis for Christian faith. We are so much stronger in a team than on our own and marriage is the best human team, designed by God, for navigating the world together for Him. One’s children too will be faced with a variety of arguments as to why they shouldn’t follow the faith of their parents. Thankfully there are good, logical reasons why they can make the Christian faith their own. It is an important parental responsibility to convey these reasons to one’s children and to help them grapple with the questions that will arise as they grow up. While this is important for both men and women to do, women usually spend more time with their children than men do, and they need to be prepared for the particular opportunities that this presents. Women have immense power as mothers to affect future generations. William Ross Wallace was right when he said that “the hand that rocks the cradle rules the world.” Mothers and those who would be mothers need to equip themselves so that they may equip their children for godly influence in all spheres of life, not least of all in Christian apologetics.

It’s nice when women look forward to practicing apologetics in their roles of wife and mother. I think if women were more forward thinking, then they would not only see the value of learning apologetics for themselves, but they would also expect men to know apologetics.

I think I remember something about Mary… this other post on the prosperity gospel posted at Far Above Rubies was written by a “Mysterious M” from South Africa. Could it be the same person?