When Jesus says "Amen, Amen I say to you" is that a hint that the next thing He says should be taken "more literally" than usual?

At my son's confirmation class last night the teacher told him that our priest told him (and I haven't confirmed this with the priest) that whenever Jesus says "Amen Amen I say to you", that this is a hint that the next words He says should be taken literally. For instance > Amen, amen, I say to you, whoever believes has eternal life. I am the bread of life. Your ancestors ate the manna in the desert, but they died; this is the bread that comes down from heaven so that one may eat it and not die. I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world. > > John 6:47-51 NAB [And several more](https://www.biblegateway.com/quicksearch/?qs_version=NABRE&quicksearch=amen+amen&begin=50&end=50) This was news to me and I'm gonna go hunt down all those instances, but is this a "well known sort of thing" when it comes to Biblical scholarship especially in Catholic circles? The Catholic understanding of scripture is that all scripture is first and foremost to be interpreted literally, but is the emphasis on amen amen, supposed to stand out and how does it stand out in relations to places where Jesus doesn't place this sort of emphasis, do they form the basis for a higher order of commandments?