'All our merely natural activities will be accepted, if they are offered to God, even the humblest: and all of then, even the noblest, will be sinful if they are not. Christianity does not simply replace our natural life and substitute a new one: it is rather a new organisation which exploits, to its own supernatural ends, these natural materials.'
CS Lewis, 'Learning in War-Time' in CS Lewis Essay Collection: Literature, Philosophy and Short Stories, p.174.