The ultimate Catholic bible reference site is now online, courtesy of the Vatican.
The biblical text is cross-referenced against the Church fathers, so one can see commentary about any passage in the Bible.
For example, I randomly chose an incident in the Gospel of Mark where Jesus heals a paralyic (Mark 2:1-12).
Then I hit Comment, which brings up:
St. Augustine, Sermon LXXV:
49 He cured the sick man, and told him to carry his couch, and go unto his house.50 And so too He said to the sick of the palsy whom He cured.51 What is it to carry our couch? The pleasure of our flesh. Where we lie in infirmity, is as it were our bed. But they who are cured master52 and carry it, are not by this flesh mastered. So then, thou whole one, master the frailness of thy flesh, that in the sign of the forty days’ fast from this world, thou mayest fulfill the number forty, for that He hath made that sick man whole, “Who came not to destroy the Law, but to fulfil.”11. Having heard this, direct your heart to Godward. Do not deceive yourselves. Ask yourselves then when it is well with you in the world ; then ask yourselves, whether ye love the world, or whether ye love it not; learn to let it go before ye are let go yourselves. What is to let it go? Not heartily to love it. Whilst there is yet something with thee which thou must one day lose, and either in life or death let it go, it cannot be with thee always; whilst I say it is yet with thee, loosen thy love; be prepared for the will of God, hang upon God. Hold thee fast to Him, whom thou canst not lose against thy will, that if it chance thee to lose these temporal things, thou mayest say, “The Lord gave, the Lord hath taken away, as it hath pleased the Lord, so is it done, blessed be the Name of the Lord.”
St John Chrysostom, from his sermon on the Hebrews:
Why said he not, of the world, instead of“the people”? for He bare away the sins of all. Because thus far his discourse was concerning them [the Hebrews]. Since the Angel also said to Joseph, “Thou shalt call His name Jesus, for He shall save His people.” (Mt 1,21). For this too ought to have taken place first, and for this purpose He came, to save them and then through them the rest, although the contrary came to pass. This also the Apostles said at the first, “To you [God] having raised up His Son, sent [Him] to bless you” (Ac 3,26): and again, “To you was the word of this Salvation sent.” (Ac 13,26). Here he shows the noble birth of the Jews, in saying, “to make reconciliation for the sins of the people.” For a while he speaks in this way. For that it is He who forgives the sins of all men, He declared both in the case of the paralytic, saying, “Thy sins are forgiven” (Mc 2,5); and also in that of Baptism: for He says to the disciples, “Go ye and teach all nations, baptizing them in the Name of the Father, and of the Son, and of the Holy Ghost.” (Mt 28,19)).
St Cyril of Jerusalem, from a sermon on faith.
8. Yea, so much power hath faith, that not the believer only is saved, but some have been saved by others believing. The paralytic in Capernaum was not a believer, but they believed who brought him, and let him down through the tiles34 : for the sick man’s soul shared the sickness of his body. And think not that I accuse him without cause: the Gospel itself says, when Jesus saw, not his faith, but their faith, He saith to the sick of the palsy, Arise35 ! The bearers believed, and the sick of the palsy enjoyed the blessing of the cure.
9. Wouldest thou see yet more surely that some are saved by others’ faith? Lazarus died36 : one day had passed, and a second, and a third: his sinews37 were decayed, and corruption was preying already upon his body. How could one four days dead believe, and entreat the Redeemer on his own behalf? But what the dead man lacked was supplied by his true sisters. For when the Lord was come, the sister fell down before Him, and when He said, Where have ye laid him? and she had made answer, Lord, by this time he stinketh; for he hath been four days dead, the Lord said, If thou believe, thou shalt see the glory of God; as much as saying, Supply thou the dead man’s lack of faith: and the sisters’ faith had so much power, that it recalled the dead from the gates of hell.
And this is just the surface -- all the references to the passage in the Catechism are also linked.
I am going to be spending a lot of time there . . .
Hat tip to Domenico Bettinelli . . .