edwinG:
The Catholic Church teaches ( I suppose this to be correct) that public revelation ended with the death of the last apostle.
What does this mean?
The faith was delivered once for all to the Apostles:
In John 14:25-26, Jesus said to the Apostles, “These things I have spoken to you, while I am still with you. But the Counselor,
the Holy Spirit, whom the Father will send in my name, he** will teach you all things, and bring to your remembrance all that I have said to you**.”
In John 16:12-13, Jesus said to the Apostles, “I have yet many things to say to you, but you cannot bear them now. When
the Spirit of truth comes, he** will guide you into all the truth**; for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.”
In Jude 1:3, it says, “Beloved, being very eager to write to you of our common salvation, I found it necessary to write appealing to you to contend for
the faith which was once for all delivered to the saints.”
Anything contrary to the original teachings (traditions), which were received from the Apostles either by word of mouth or by letter, is to be avoided like the plaque.
In 1 Cor 11:2, St. Paul said, “I commend you because you …
maintain the traditions even as I have delivered them to you.”
In 2 Thes 2:15, St. Paul said, “So then, brethren, stand firm and
hold to the traditions which you were taught by us, either by word of mouth or by letter.”
In Gal 1:6-9, Paul says, “I am astonished that you are so quickly deserting him who called you in the grace of Christ and turning to a different gospel–not that there is another gospel, but there are some who trouble you and want to pervert the gospel of Christ. But even if we, or an angel from heaven, should preach to you a gospel contrary to that which we preached to you, let him be accursed. As we have said before, so now I say again,
If any one is preaching to you a gospel contrary to that which you received, let him be accursed.”