What are human thoughts? Where do they come from? Are they engineered or random accidents. We really only have two options if naturalism and materialism are true then your thoughts are random chemical reactions as triggered by some natural chain reaction of prior chemical reactions. It's inescapable. This to me would seem irrational and make it impossible thoughts untrustworthy. However if there is a God, He has give us the ability to think logically and rationally, to string coherent thoughts together then articulate them to others like we are doing in this dialogue. Therefore a Maximally great being is necessary for the engineering of rational logical thought processes.