by Eavesdropper » July 13th, 2006, 7:20 pm
I think it is in "Mere Christianity" that Lewis writes that "faith is holding on to something your reason has once accepted in spite of your changing moods." In other words, faith and reason are not opponents, but allies against one's unstable emotions.
Likewise, in Perelandra (?) the main character explains that while his _reason_ accepts that the eldil will carry him safely through space, his _nerves_ do not, and compares his experience to that of a man who, having faith in a future life, is facing a firing squad (the character jokes that it might be "good practice"). Again, reason and faith are similar.
I also vaguely (someone please correct me if I'm wrong) remember reading something in Lewis's study of medieval literature ("The Discarded Image") that the medieval concept of reason included the moral sense.
I would not like to suggest, however, that Lewis regarded reason and faith as equivalent. He does argue, however, against the common perception that they are dichotomous.
I hope that helps! Sorry for the stilted language - the shades of my high school essays are coming back to haunt me.