Cosmological Argument for the Existence of God
Start with observations about how universe works and from this try to explain why it exists. also known as the first cause argument for the existence of God. Fundamentally, the argument is based on the claim that God must exist due to the fact that the existence of the universe requires an explanation, which must be God.
Aquinasās First Way: the unmoved mover
In Aquinasās First Way, he concentrated on the existence of change, or motion, in the world.
Everything is both in a state of actuality (how it is) and potentiality (what it might become).
All things that are moved (the potentiality becomes the new actuality) are moved by something else, things canāt move themselves.
The mover is moved by something else, which is moved by something else and then something else.
This cannot go on for infinity because there would be no first mover so nothing would have started moving at all.
So, there must be a first mover.
This first unmoved mover is God.
Aquinasās Second Way: the uncaused causer
Aquinasās Second Way is similar to his first, but it focuses on the concept of change.
Nothing can be its own efficient cause because it cannot have existed before itself.
Things that are causes must themselves be caused, otherwise the effect would be taken away.
We cannot go back to infinity (infinite regress is impossible) because there would be no first cause so all later effects couldnāt have happened.
Therefore, there must be a first efficient cause that is not instead caused.
The first uncaused causer is what everyone understands to be God.
Aquinasās Third Way: contingency and necessity
Everything in nature is contingent, it relies on something to have brought it into existence.
If we trace back, nothing existed, but then nothing could have begun to exist because nothing can come from nothing (everything has to come from something)
Therefore, there needs to be a being that isnāt contingent: a necessary being.
Necessary beings could have their necessity come from another being.
But this cannot go back to infinity.
So, there must be a being that has its own necessity which causes other beings.
This is what people call God.
Gottfried Leibniz
Leibniz raised the question āwhy is there something rather than nothing?ā, questioning why anything exists at all. He offered a form of the cosmological argument, based on his Principle of Sufficient Reason which states that everything which exists must have a reason or a cause for its existence. According to the Principle of Sufficient Reason:
If something exists, there must be a reason why that thing exists.
If a statement is true, there must be a reason why that statement is true.
If something happens, there must be a reason why that thing happens.
Whether or not we know the reason why something exists, or is true, or happens, there still must be a reason, known or unknown. It doesnāt matter if itās eternal or not ā we still need a reason for it.
Humeās Criticisms of the Cosmological Argument
Can we make the jump from Aquinasās observations to the Christian God? The effect cannot immediately point towards a particular cause because causation is a psychological concept, we cannot make links that are beyond our experience ā we could imagine anything to create the universe: a stupid God, a committee of Gods, a demon etc. God is just one of a large number of possible hypotheses.
Is it plausible for anything but a transcendent God to create the universe? Aristotle, Aquinas: need a necessary being that would have to transcend the rest of the universe to exist in a unique, all-powerful way.
When we look at the world, we have only the effect to look at ā the cause is hidden from us. He uses the example of a pair of scales with one end hidden from view: we can see that the other end outweighs it, butĀ we have no means of knowing by how much.
It isnāt necessary to suppose that everything has a cause
Just because everything in the universe has a cause or reason to exist, doesnāt mean the entire universe has a cause or reason to exist (just because you can explain the cause of 20 particles of matter doesnāt mean you can explain the cause of the group of the particles)
Bertrand Russell: just because every human being has a mother, doesnāt mean that the human species as a whole has a mother.
BUT modern science suggests there is a definite beginning to the universe
Hume: Why may not the material universe be the necessarily existent being?ā Why could we not accept that the universe is eternal and the cause of all the things in it rather than looking to God for an explanation












