How do we come to believe? Justin Martyr says:
1) "A man seeks the truth by the unaided effort of reason and is disappointed.
2) It is offered him by faith, and he accepts.
3) And, having accepted, he finds that it satisfies his reason."

In other words, God reveals to us things we could never figure out on our own. Upon receiving his revelation, we then realize it makes perfect sense.

In their book entitled Handbook of Christian Apologetics: Hundreds of Answers to Crucial Questions, Peter Kreeft and Ronald K. Tacelli also sum it up well . They say, "Revelation takes us for an easy ride up the mountain of truth in a divinely provided helicopter. Reason struggles and scrambles up the hard, slow footpath, and doesn't get nearly as far up. Neither invalidates the other. But millions can get to the top in the helicopter, while only a few Aristotles can get more than a few feet up the path by walking."