Larkus wrote:Mick wrote:
Even now I do not understand why some people do not accept this casual premise on grounds that "it has never been shown that anything ever began to exist." I'm not too sure what it means to "show" this premise (Can we show to the skeptic that other minds exist?), but it seems fair to grant that human beings did not exist 1 million years ago, but now we do. Human beings were formed a finite time ago and differ from any other thing we know of. That we are a mere rearrangment of energy (or whatever), if we are at all, does nothing to affect this point.
I'm unsure what the sticking point is.
1. I think the sticking point is, that Craig equivocates on the meaning of "beginning to exist". Craig doesn't distinguish between an origin of things out of preexisting matter and energy and an origin of things out of nothing. There is plenty of evidence for the former, but (to my knowledge) no evidence for the latter.
2. Did human beings begin to exist according to Craig's own definition? I think that is not so clear.
William Lane Craig's definition of "beginning to exist":
http://www.reasonablefaith.org/site/New ... le&id=8243
"The kalam cosmological argument uses the phrase 'begins to exist.' For those who wonder what that means I sometimes use the expression 'comes into being' as a synonym. We can explicate this last notion as follows: for any entity e and time t,
e comes into being at t if and only if (i) e exists at t, (ii) t is the first time at which e exists, (iii) there is no state of affairs in the actual world in which e exists timelessly, and (iv) e’s existing at t is a tensed fact."
You have pointed out, that "human beings did not exist 1 million years ago, but now we do". This is sufficient to fulfill the everyday-definition of "beginning to exist" - something begins to exist if it exists at a given time, and there is some earlier time at which it did not exist. However, it is not sufficient to fulfill Craig's definition. Showing, that something exists now but did not exist in the past does not equal showing that there was a first time at which it existed. It could for example be that human beings evolved in a gradual process where there was no first time at which human beings existed.
If there was no first time at which human beings existed then human beings did not begin to exist, according to Craigs's definition of "beginning to exist".
In any case, Craig's definition of "beginning to exist" seems to be insufficient.
What Craig is doing here is making it clear that his argument presupposes an A-theory of time. On b-theory, there is no 'beginning to exist' since there is no becoming; the time frames of whatever object (in the future, past, present) are all equally real. This has nothing to do with the vagueness of when human came to be from their ancestors. So long as we understand that humans came to be, it does not matter when they came to be or if we can determine this ourselves. surely humans came to be at some point, whether we can identify it or not. Otherwise, either human being did not begin to exist because they always were or 'human being' is just a useful linguistic convention which has no basis in reality- that is, there is no such thing as a human being. but it seems to me that science, or biology at any extent, is committed to the existence of species.