For LDS readers, the insights of C.S. Lewis concerning Christian doctrine are quite startling because we see this so seldom in the writings of many other Christian authors. Lewis has probably been quoted more often than any other non-LDS author in General Conference (I count 19 mentions) and has been referred to as “the thirteenth apostle” with only a touch of humor by some LDS observers.
C.S. Lewis was a committed member of the Church of England, although some have noted Roman Catholic influences in many of his writings, possibly absorbed from his close friend, J.R.R. Tolkien. We read so many insightful and wry observations from C.S. Lewis concerning Christianity that we may conclude that his view of religion is all tea and biscuits — all rewards and no consequences.
The following will correct that misapprehension:
When the author walks on the stage, the play is over.
God is going to invade [the earth], all right: but what’s the good of saying you’re on his side then, when you see the whole natural universe melting away like a dream and something else — something it never entered your head to conceive — comes crashing in; something so beautiful to us and so terrible to others that none of us will have any choice left?
For this time it will be God without disguise; something so overwhelming that it will strike either irresistible love, or irresistible horror into every creature. It will be too late then to choose your side. There is no use saying you choose to lie down, when it’s become impossible to stand up.
That will not be the time for choosing: it will be the time when we discover which side we really have chosen, whether we realize it or not.
Now, today, in this moment, is our chance to choose the right side. God is holding back to give us that chance. It will not last forever; we must take it or leave it.
Mere Christianity, page 65
(paragraph breaks inserted to enhance online readability)