You never know how much you really believe anything until its truth or falsehood becomes a matter of life and death to you. It is easy to say you believe a rope to be strong and sound as long as you are merely using it to cord a box. But suppose you had to hang by that rope over a precipice. Wouldn’t you then first discover how much you really trusted it? The same with people. For years I would have said that I had perfect confidence in B.R. Then came the moment when I had to decide whether I would or would not trust him with a really important secret. That threw quite a new light on what I called my “confidence” in him. I discovered that there was no such thing. Only a real risk tests the reality of a belief.
- C.S. Lewis, A Grief Observed, p. 25