* First, 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.
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* Next, 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.
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