Ruskin was heavily indebted to Coleridge, formulating a theory of the imagination similar to Coleridge's while adding and developing a belief in the imagination's autonomy. Ruskin was regarded by contemporaries as a critic who paralleled Coleridge in subtlety of perception. Ruskin once observed that he knew 'nearly every line' of both the Ancient Mariner and Christabel, and he praised Coleridge's natural and simple style ( Works, 4.391). But Ruskin criticized Coleridge's poetry in general for exhibiting signs of the pathetic fallacy ( Works, 5.206-07). Ruskin also deplored what he perceived as the lack of moral fibre in the poet's life and his work, comparing Coleridge to Wordsworth in terms very much to the former's disadvantage ( Works, 4.391-93).