The idea that the universe could not exist under different enviroments means points towards something that MUST EXIST.
Aquinas proposes that everything in nature at one time did not exist. If this is true then there is nothing in existence as there would be nothing to bring anything to existence.
(So there must be something that exists by neccesity)
Every neccesary thing has its existence caused by another. But an infinite regression of things is impossible- therefore some being must exist which causes other things their neccesity. This is God.
LINKS WITH WAY 1 & 2 BY REJECTING INFINITE REGRESSION.
Criticsms- Kant rejects the argument with the same basis he does in the ontological argument (existence is not a predicate) But this is not entirely fair as this argument is a posteriori and not a priori.
Mackie- Must there be a neccesary being?
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