C S Lewis speaking of his conversion experience:

As the dry bones shook and came together in that dreadful Valley of Ezekiel’s, so now a philosophical theorem, cerebrally entertained, began to stir and heave and throw off its graveclothes, and stood upright and became a living presence. I was to be allowed to play at philosopy no longer. It might, as I say, still be true that my “Spirit” differed in some way from the God of popular religion. My Adversary waived the point. It sank into utter unimportance. He would not argue about it. He only said, “I am the Lord”; “I am that I am”; “I am.” People who are naturally religious find difficulty in understanding the horror of such a revelation. Amiable agnostics will talk cheerfully about “man’s search for God.” To me, as I then was, they might as well have talked about the mouse’s search for the cat.