Here’s an illustration of what happens when someone ignores that advice.
It’s an “icon” of all the special people riding in the big boat.
On the ground are bad people sniping and shooting and pointing spears and generally exercising hostility at all the special people riding in the big boat.
That’s supposed to be Martin Luther looking like an Old West stagecoach robber. And proving that this iconographer has read his Hal Lindsey, we have the anti-Christ hanging out with a “king” of Israel and the Harlot of Babylon. Over there is the pope, not any specific pope, but a generic Pope. Oh, and the “prophet” who must not be named. And on the far right is Patriarch Athenagoras, who committed the sin of talking to a pope, which makes him the “father of ecumenism” — which is pretty remarkable, considering that the ecumenical movement is rooted in the 19th century.
The marketers of this illustration are very good at pointing out the dangers of ecumenism, but not so good at noticing the dangers of hopping from boat to increasingly smaller boat in search of the one so small that it will hold only the people sufficiently holy to be part of their world.
But what do I know? By their definition, I’m not Orthodox either.
This is part of the reason why, when someone says, “I don’t like organized religion,” I’m inclined to say, “Have I got a Church for you.”