What is the fine-grained topic of the following text: Canon Rawnsley, founder of the National Trust, wrote: 'Many a time as I have paced the dewy pebbles of Bassenthwaite Lake in thought, and heard the ripple washing in the reeds or seen the water brighten to the moon, I have felt that in the writing and rewriting of that noble passage that tells of the passing of Arthur, the poet may have almost unconsciously woven into his verse the calm and sounds, the sight and scene of beautiful Mirehouse'. Only return the topic.
Canon Rawnsley's reflections on Bassenthwaite Lake and its influence on literature.