THE SIN OF DISBELIEF.
To such people[1] the word of the prophet can be applied most fittingly: The fool says in his heart, there is no God. They who say that nothing is seen by God almost deprive him of eyes and even take away substance from him. For when they say he sees nothing, they say he does not exist at all. Although no evil deed is based on reason, because crime cannot be joined with reason, there is no sin, I believe, more irrational or senseless. What is more insane than for anybody, who does not deny that God is the creator of the universe, to deny his governance? How does he admit that God created the world and neglects what he created? As if, indeed, he took pains in creating all things so that he would neglect what he had made!
The Governance of God 4.9