He proves that nature is our teacher because it tells us what is right and wrong. Our intellect, understanding, and free will help us act upon what we have learnt through nature and obtained through our senses. We then make judgments in life even though we don't have complete knowledge of anything and everything is doubtful and believe that God will pass the best judgment because God is the all knowing.
Descartes created his Meditations to unlearn everything and build stronger foundations for all the ideas that exist within humans. He said that often human beings make errors of judgment habitually and believe things without reason. He wanted to prove to the world that God exists not through religion or science but through a rationalized argument. In his meditations Descartes discusses how we know that we exist as human beings, how the senses work, how we gain knowledge, make judgments and that God exists and is the best judge of all.
"Nevertheless, the belief that there is a God who is all powerful, and who created me, such as I am, has, for a long time, obtained steady possession of my mind. ...Show more