In “Meditation Three: Concerning God, That He Exists,” Descartes first states that all things that can be felt by his senses exist within him. The way in which he values his own thoughts is by evaluating them to outside external forces because if his own ideas could not be challenged in any way they could never be proven wrong.
Descartes believes that there are ideas that are derived from the world outside him because there are things that do not depend upon him. He gives an example of feeling the “heat”. He feels heat from an outside source, something other than himself. He also says that when he thinks about something that is true, it comes to him spontaneously and not as something being taught by nature.
Descartes admits the existence of God through rational thought. First, he admits that he exists. Then, he admits that God exists within him, and therefore, God must exist too. Descartes ideas are reflections of the way to know the true God. He knew that there are secrets of God in all things, because all human wisdom and science was hiding in ideas.
God is the Almighty because God created the earth, all things, and human. Descartes believes in God, which reinforce, Descartes existence. He believes that he exists, and God exists. God created Descartes, people, everyone, and nature. For example, then he is, Descartes says, “there is a God, I exist”(25). Because God made Descartes so he knows God, like people know their fathers because people are made by their fathers. “God created me makes it highly plausible that I have somehow been made in his image and likeness, and that I perceive this likeness, in which the idea of God is contained, by means of same faculty by which I perceive myself/ all things were created too”(35). Similarly to the old testaments, "In the beginning God created the heavens and the earth. (Genesis 1: 1), The God said, “Let us make man in our image, in our likeness”(26), and “God created in his own image, in the image of God he created him”(Genesis 1:27). Descartes and Genesis have same ideas.
Descartes concludes that God “necessarily” exists because he believes that there is a substance that is infinite, intelligent, powerful and independent that created him, and all these are not initiated within him alone. Descartes states, “I have no reason for thinking that there is a God who is a deceiver” (25). The ideas of God are not false, he is not a deceiver, and the idea that Descartes has of God is true and clear. Descartes perceived reality of God and he knows that God is true. “I think I intuit as clearly as possible with the eyes of the mind”(25). God is honest, but human is not honest. Descartes says that “let anyone who can do so deceive me”(25). God does not deceive, but humans can deceive other people.
