"One young devil asked the old man: "How did you manage
to bring so many souls to hell?" The old devil answered: "I
instilled fear in them!" Answers the youngster: "Great job!
And what were they afraid of? Wars? Hunger?" Answers the
man: "No, they were afraid of the disease!" For this
youngster: "Does this mean they didn't get sick? Are they
not dead? There was no rescue for them?"
The old man answered: "but no, they got sick, died, and
the rescue was there." The young devil, surprised, answered:
"Then I don't understand???" The old man answered: "You
know they believed the only thing they have to keep at any
cost is their lives.
They stopped hugging, greeting each other. They've moved
away from each other. They gave up all social contacts and
everything that was human! Later they ran out of money, lost
their jobs, but that was their choice because they were afraid
for their lives, that's why they quit their jobs without even
having bread.
They believed blindly everything they heard and read in the
papers.
They gave up their freedoms, they didn't leave their own
homes literally anywhere. They stopped visiting family and
friends. The world turned into such a cσncєnтrαтισn cαмρ,
without forcing them into captivity.
They accepted everything!!! Just to live at least one more
miserable day . . . And so living, they died every day!!! And
that's how it was very easy for me to take their miserable
souls to hell.                                                       "
C. S. Lewis - "Old Devil's Letter To The Young" 1942_

I imagine Lewis' writings have helped a good number of people avoid to some degree the wiles of the devil.  For instance somewhere in his writings he said to the effect that the devil is always happy (in a manner of speaking) if he can take away one of our vices (comparing them I think to the common cold) IF in so doing he could replace it with cancer (pride), the gold standard gateway to hell.  For example, the alcoholic who gives up drinking and glories in his having put the plug in the jug at every chance he gets to speak inside or outside of an an AA meeting, always maintaining a secret pride in his (not His) power in allowing him to do it, not withstanding his sometimes outward claims to the contrary.

Query (irony?) as to where Lewis is now and what was the ultimate thing which brought him there.