What roles do faith and evidence play in order to reach the truth?
How do they relate to each other?
You have to have faith in evidence to believe that it can lead you to truth. Everything can be traced back to a starting point in faith. In philosophy you tend to challenge the presuppositions of different ideas and beliefs. However, to begin an argument, you must start with some sort of foundation. But how does that foundation begin if you are to challenge the presuppositions of different things? At some point in our life we have to choose a foundation. And every foundation has a "weakness." This is why Socrates was considered wise because, while everyone was thought to be wise through their own eyes, he knew that he knew nothing.
Faith-a belief in the face of a lack of evidence. Evidence-something supporting a hypothesis of some kind. Something is not evidence unless it is true. Faith has nothing to do with truth and often leads people away from it rather to closer. Evidence is the truth, used to back up a broader truth. They relate because one is practically the opposite of the other.