One of the many arguments for the existence of God is the Argument from Reason. In essence, it argues that if the world is physical and nothing more, then everything must be explained by physical processes and the laws governing them. So atoms move and combine in accordance with the laws of physics and chemistry.
If that is the case, then that applies to the atoms in our brains. So if I come to a conclusion (say, a conclusion in Euclidian geometry, or that God exists or doesn’t exist), that conclusion must be, and is, explained by the movement of atoms according to those laws.
But for the conclusion to be true, it needs to be justified by logic and reasoning, not just by the movement of atoms. So, it is argued, the existence of the human ability to reason provides an argument that world is more than the physical (i.e. naturalism isn’t true), and that our brains are the creation of a reasoning God.
An argument from Pythagorus
Victor Reppert is a philosopher whose blog, Dangerous Idea, I have followed for many years. A few months ago he had an interesting post on this, The argument from reason and the triangular garden.
I think it is worth reading:
You can read a larger discussion of this argument (and more!) in Free will, evolution and human rationality.
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