Aquinas' Cosmological Argument : CAUSATION
- The is an order of efficient cause (every event has a cause).
- Nothing can be the cause of itself.
- Imagine this order of causation goes back infinetely -> then there would be no first cause.
- (This is a reductio ad absurdum) Without a first cause there would be no subsequent causes, but this is false.
- Therefore there must be a cause which is the source of all causes, and this we call God.
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Aquinas' Cosmological Argument : MOTION
- Things in the world change -> they're in motion.
- Nothing can move or change itself.
- Imagine everything was a secondary mover -> in other words that it was being moved by something else.
- If this is true then there would be no prime mover (unmoved mover), and hense nothing would be in motion. But this is false (reductio ad absurdum).
- Therefore there must be an unmoved prime mover, whom we call God.
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Aquinas' Cosmological Argument : CONTINGENCY
- Things in the world are contingent.
- Imagine everything was contingent, then there would be a time when everything had passed out of existance -> that there was nothing.
- (Reductio ad absurdum). If this were correct then there would be nothing now, but this is false.
- Therefore there must be at least one thing that is necessary (not contingent)
- For everything that is necessary it either has the cause of its necessity in itself or outside itself.
- Imagine every necessary thing has that cause of its necessity outside of itself.
- (Reductio ad absurdum) If this were true than there would be no ultimate cause of necessity.
- Therefore there must exist a necessary being which causes and sustains all other necessary and contingent beings -> this thing we call God.
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