Faith isn't Un-reason
Suppose you have a friend. Every time that friend makes you a promise, he keeps it. Every time that friend tells you a fact, he turns out to be right — even though you don’t always believe him at first. Your friend is always honest with you, even when it’s difficult to hear.
Your friend says something. Is it reasonable to believe him? Do you trust him?
I define faith as trust. Others, though, hear “faith” and think, “belief in a set of religious ideas despite a large volume of evidence to the contrary.”
Some people don’t trust the Bible, but do trust their own hearts, or vice-versa. Trust can be reasonable or not. You generally trust your senses because they’ve been generally trustworthy.
Faith isn’t the opposite of reason. It’s a matter of what you trust enough to believe.