You will know the truth and the truth will set you free
Timothy Keller is an amazing teacher. I have yet to read one of his books but his podcast is fantastic. Here he talks not just about the need to think about our faith, but the absolute necessity of thinking when related to faith.
"Faith begins with reasoning..... by faith we think... you cannot be Christian without using your brain to its uttermost.... the reason there is not much faith today is because there is not much thinking today.... thinking leads to faith.... thinking is the basis to faith".