Now, one of the truths that reason can discover is that God is a person, and the central claim of the Bible is that this Person has not remained utterly hidden but has, indeed, spoken. As is the case with any listener to a person who speaks, the listener to the divine speech has to make a choice: do I believe him or not? The decision to accept in trust what God has spoken about himself is what the Church means by “faith.” This decision is not irrational, for it rests upon and is conditioned by reason, but it presses beyond reason, for it represents the opening of one heart to another. In the presence of another human being, you could remain stubbornly in an attitude of mistrust, choosing to accept as legitimate only those data that you can garner through rational analysis; but in so doing, you would close yourself to the incomparable riches that that person might disclose to you. The strict rationalist, the unwavering advocate of the scientific method, will know certain things about the world, but he will never come to know a person.
--Robert Barron, Vibrant Paradoxes: The Both/And of Catholicism