But perhaps the most mysterious thing he ever said about it was this. I was questioning him on the subject—which he doesn’t often allow—and had incautiously said, “Of course I realise it’s all rather too vague for you to put into words,” when he took me up rather sharply, for such a patient man, by saying, “On the contrary, it is words that are vague. The reason why the thing can’t be expressed is that it’s too definite for language.”

-C.S. Lewis, Perelandra