"How is faith in Christ attained? The apostles attained it preparatorily by His personal teaching, fulfillingly by the Pentecostal gift of the Holy Spirit. So we also: preparatorily by the teaching of His living, apostolic Church, fulfillingly by the operation of His grace. Not from lifeless records, but from the *living witness* of a living organism sustained and animated by Him, from immediate contact with Christ living in His Church."
In the comments, Clare posted this from Adam's Spirit of Catholicism, and she also recommended Amy Welborn's book discussion, also sent to us by David. I have more to add on this topic, but it will have to wait for me to take care of some other stuff first.