(Yes, I know this isn’t a Catholic quotation. I went investigating anyhow.)
I would teach children music, physics and philosophy, but most importantly music, for the patterns in music and all the arts are the key to learning. – Plato
It sounds like something that might be in The Republic, but ….
- Wikiquote has it as an unsourced quotation.
- A generic Internet search for it is of course hopeless (though I tried anyhow).
- It’s not in the Jowett translation of The Republic, which I understand has translation issues but is the only translation freely available that I could find. (Hint: I am not going to try to wade through The Republic in Greek.)
I did find it on Google Books in a couple spots, one of which gives as a reference “National Coalition for Music Education, 1997”. But a Google search for whatever document that may be referencing came up empty.