The New Testament contains embarrassing promises that what we pray for with faith we shall receive. Mark 11:24 is the most staggering. Whatever we ask for, believing that we’ll get it, we’ll get... How is this astonishing promise to be reconciled (a) With the observed facts? And (b) With the prayer in Gethsemane, and (as a result of that prayer) the universally accepted view that we should ask everything with a reservation (‘If it be Thy will’)?—C. S. Lewis, Business of Heaven, p. 189.