Thomas Aquinas (1225-1274) was the most influential philosopher in the development of the cosmological argument. ... In Aquinas's first way he talks of motion. ... Therefore Aquinas closed by saying there must be a "first cause" which in itself is uncaused. Aquinas" third was delves into the notion of things being either contingent or necessary. ... In Aquinas" 2nd way he mentions the issue of causality. ...

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• Grade Level: Undergraduate