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No finite thing can come from nothing. Every finite thing has a beginning. Every finite thing was caused.
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If every finite thing has a beginning, then there was a point in time when no finite thing existed.
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For the first finite thing to exist there must exist something that caused it into existence. A first cause. A prime mover.
- This first cause or prime mover is self-existent and infinite, as its existence can not be dependent on, nor can it be limited by any other cause.
- This "uncaused cause" must exist in order for anything else to exist. The reason why there is something rather than nothing.
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And this we understand to be God.
For further reference see:
The Existence of God, http://www.newadvent.org/cathen/06608b.htm
Cosmological Argument, http://en.wikipedia.org/wiki/Cosmological_argument
The Nature and Attributes of God, http://www.newadvent.org/cathen/06612a.htm