What are the most authoritative statements in this regard, besides Titus 3:10?
Is there any explicit teaching saying Catholics cannot be in communion with heretics?
I know this is of course obvious and it goes without saying, but you know how novus ordo people are, they utterly do not have any Catholic sense left, well the ones im dealing with at least.
The Dimonds debated with a man from Norway ( or sweeden? ) who I think was called Suengins. You can search their youtube channel for this debate.
This was a debate that I felt the Dimond's lost, but they published it anyway. Their opponent held the position that it was not lawful to go into the meeting houses of heretics, while the Dimonds said that they should take advantage of the sacraments wherever they can. Lots of church teaching quotes in that debate if you're interested.
Not advertising the Dimonds, but this debate is a good source of quotes from popes and councils on the matter. I like their debates and learn a lot from what is said. Sorry if I got the name wrong, but you'll just have to search for it.
I heard that debate and it was against a guy called Eli, not Sungenis. Bob Sungenis is a defender of the Novus Ordo.
The one they had the debate with is one of three "monks" who operate various websites, stbirgitta.com and doomsdaytube.com and others that link to the same one.
I don't think they lost at all, on the contrary, Eli just sounded like an automaton repeating the same things over and over again. Plus he had a really bad accent and bad pronunciation and it was hard to listen to him drone on and on.
Not that I agree with the Dimonds on going to heretics for the sacraments of course.
I know all the quotes from that debate and I was looking for others in addition to those. I think actually there are only 2 quotes that directly say you can't pray with heretics from that debate.