How valid do you think the Cosmological Argument is as proof for the existence of God?

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How valid do you think the Cosmological Argument

is as proof for the existence of God?

The cosmological argument is a classical argument for the existence of God. It is also referred to as the first cause argument. The cosmological argument concludes Gods existence from a posteriori premise. A posteriori means an argument in which the truth of a proposition may only be known to be true after empirical data has been used to prove the proposition true or false. The argument is a posteriori because it is based upon what we can see in the world and universe. The argument is based upon the fact that there was a first cause behind the existence of the universe. The classic, basic cosmological argument is as follows. Things come into existence because something caused them to occur, and that things are caused to exist, but they do not have to exist. There is a chain of events that goes back to the beginning of time, and time began when the universe was created. We know the universe came about around 15 billion years ago. There must have been a first cause that brought the universe into creation. This first cause must have necessary existence to cause the contingent universe. God has necessary existence, this means God exists outside our space and time, however, he is able to create within it. Because of this, God is the first cause of the contingent universe's existence.

The argument has many forms and has been presented in many different ways. In each form, the argument focuses upon the causes that lead up to the existence of things. The argument appears to answer the questions, how did the universe begin? Why was the universe created? And who created the universe? Philosophers over the centuries have used different terminology to describe the first cause of the universe. Philosophers have been known to refer to this first cause as 'the first cause', 'the first mover', 'necessary being', 'self-existing being', and of course, 'God'. The cosmological argument pre-dates Christianity, and Plato, the student of the 'father of philosophy' Socrates, developed one of the earliest forms. Plato argued that the power to produce movement logically comes from the power to receive and pass it on. In order for there to be movement in the first place, there must have been an uncaused cause to start the movement. Plato termed this uncaused cause the 'first cause' or 'first mover'.

St. Thomas Aquinas developed the most popular version of the cosmological argument, in his Five Ways that proved the existence of God. He called this demonstratio for the existence of God. He put this forward in his book Summa Theologica. The first three of his five ways to prove the existence of God form the cosmological argument. These three are motion or change, cause and contingency.
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In the first cause, Aquinas said that in the world there are things that show motion. He said whatever caused this motion must have been moved by something else. Aquinas believed that the chain of movement cannot go back to infinity, and he believed there must have been a prime mover, which itself was unmoved. Aquinas said that the unmoved mover began movement in everything without actually ever being moved itself. For Aquinas, this mover was God. Aquinas was talking about movement in a broad sense. He included not only movement from one place to another, but also ...

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