Schweitzer may have been a thoughtful guy but I think this case is a reach; after all the vast majority of Bach's work had no libretto at all (including for example all the organ fugues, and the Goldberg variations and Brandenburg concertos).
However a counterexample from my own life: I only learned German starting in my late 20s and when, 10 years later I heard the Matthäus-Passion and could understand the lyrics I wept...and I don't even know much about christianity.
However a counterexample from my own life: I only learned German starting in my late 20s and when, 10 years later I heard the Matthäus-Passion and could understand the lyrics I wept...and I don't even know much about christianity.