The First Way
The first and more manifest way is the argument from motion. It is certain, and evident to our senses, that in the world some things are in motion. Now whatever is in motion is put in motion by another, for nothing can be in motion except it is in potentiality to that towards which it is in motion; whereas a thing moves inasmuch as it is in act. For motion is nothing else than the reduction of something from potentiality to actuality. But nothing can be reduced from potentiality to actuality, except by something in a state of actuality. Thus that which is actually hot, as fire, makes wood, which is potentially hot, to be actually hot, and thereby moves and changes it. Now it is not possible that the same thing should be at once in actuality and potentiality in the same respect, but only in different respects. For what is actually hot cannot simultaneously be potentially hot; but it is simultaneously potentially cold. It is therefore impossible that in the same respect and in the same way a thing should be both mover and moved, i.e. that it should move itself. Therefore, whatever is in motion must be put in motion by another. If that by which it is put in motion be itself put in motion, then this also must needs be put in motion by another, and that by another again. But this cannot go on to infinity, because then there would be no first mover, and, consequently, no other mover; seeing that subsequent movers move only inasmuch as they are put in motion by the first mover; as the staff moves only because it is put in motion by the hand. Therefore it is necessary to arrive at a first mover, put in motion by no other; and this everyone understands to be God.
Your question is typical of those who misunderstand the arguments. " What it ( and others show ) is that if there is to be an explanation of things, then there must be a cause of eveything else which not onlyhappens to exist but which could not even in principle have failed to exist. And that which cannot have failed to exist cannot in principle have had a cause. ( Edward Feser, in " So You Think You Understand the Cosmological Argument? ", in his blog spot
edwardfeser.blogspot.com/2011…nderstand.html .
There simply is no way out of the Atheist delimma. They don’t want God to exist. So they are left with a universe that cannot explain itself. Well, fine. I have no objection to that if they would just leave it at that, they are free to think or believe whatever they want.
But when they run around the world attempting to destroy people’s Faith in God and their religion I object. How can it hurt them if people believe in God? So I tell the atheist, he can’t prove there is no God, nor can he prove that the universe caused itself, and keeps itself in existence or that it causes the obvious order we see every where. The Atheist lives in an irrational universe, in spite of all his science. And please don’t quote to me any more science fiction stories about " quantum fluctuations, " the " Casimir Effect, " " multi-universes, " etc.
Linus2nd