Letter to Shelley, August 1820, in H. E. Rollins (ed.) 'The Letters of John Keats' (1958) vol. 2, p. 323; echoing Edmund Spenser 'The Faerie Queen' (1596) bk. 2, canto 7, st. 28, l. 5: 'And with rich metal loaded every rift'
"The Genius of Christianity". Book by François-René de Chateaubriand, Part IV, Book VI, Chapter XII. Translated by Charles I. White, D.D. Baltimore: John Murphy, 1871, p. 665, 1802.