It must not be supposed that I am in any sense putting forward the imagination as the organ of truth. We are not talking of truth, but of meaning: meaning which is the antecedent condition both of truth and falsehood, whose antithesis is not error but nonsense. I am a rationalist. For me, reason is the natural organ of truth; but imagination is the organ of meaning. Imagination, producing new metaphors or revivifying old, is not the cause of truth, but its condition. It is, I confess, undeniable that such a view indirectly implies a kind of truth or rightness in the imagination itself.
–C S Lewis, Selected Literary Essays, Bluspels and Flalanspheres: A Semantic Nightmare