decartes

Annotations:

• Well Descartes thought that God's existence could be proved through reason alone. As Descartes has the idea of God in his mind, he is able to define 'God' without at first knowing whether such a thing exists. Descartes defines God as being 'supremely perfect'. This means God is the greatest thing imaginable. To live up to this definition He muct be loving, powerful, all knowing and so forth. Descartes argues that he must also exist as otherwise he would not be supremely perfect, as to be perfect something must exist. Lack of existence is an imperfection. Having established that God exists, Descartes then decided that this perfect God would also prevent a person from being fooled about reality as this would not be the loving thing to do. This means the world we perceive is exactly as it seems. So the answer to your question is that all knowledge is only possible for Descartes thanks to the existence of a loving God.