Everything comes down to faith. At some point within our lives we all choose to evaluate the world through some sort of means. Some of these means are the Bible, while some of these means involves reason. However, regardless of what type of means you choose to evaluate the world with, you cannot use the very thing that you have chosen for evaluation to give credibility to the means. That is to say, myself using the Bible to advocate the Bible. Continued, it is to say that reason cannot be used to advocate reason. An outside source from your means of evaluation must be used to advocate and give credibility to your means. Therefore, faith is in everything that involves some sort of worldview. I have faith in the Bible. Others have faith in reason. It is when a source that is hostile to your means, advocates your means that one can fully trust that very thing you have so much faith in.