We have no knowledge, that is, no general principles drawn from the contemplation of particular facts, but what has been built up by pleasure, and exists in us by pleasure alone. The Man of science, the Chemist and Mathematician, whatever difficulties and disgusts they may have had to struggle with, know and feel this.

The Poems of William Wordsworth (Volume 3), Preface to the Second Edition of Lyrical Ballads (p. 491)