Oh I am glad, I am glad. And here’s a thing worth recording. Of course I have been praying for you daily, as always, but latterly have found myself doing so with much more concern and especially about 2 nights ago, with such a strong feeling how very nice it would be, if God willed, to get a letter from you with good news. And then, as if by magic (indeed it is the whitest magic in the world) the letter comes to-day. Not (lest I should indulge in folly) that your relief had not in fact occurred before my prayer, but as if, in tenderness for my puny faith, God moved me to pray with especial earnestness just before He was going to give me the thing. How true that our prayers are really His prayers: He speaks to Himself through us.
I am also most moved at hearing how you were supported through the period of anxiety. For one is sometimes tempted to think that if He wanted us to be as unanxious as the lilies of the field He really might have given us a constitution more like theirs! But then when the need comes He carries out in us His otherwise impossible instructions. In fact He always has to do all the things—all the prayers, all the virtues. No new doctrine, but newly come home to me.
–C.S Lewis, To Mary Willis Shelburne, 6 November 1953.