To Hannah More, who had expressed a wonder that the poet who had written 'Paradise Lost' should write such poor Sonnets, in James Boswell 'The Life of Samuel Johnson' (1791) vol. 4, p. 305 (13 June 1784)
James Boswell, Samuel Johnson (1786). “Boswell's Life of Johnson: Including Boswell's Journal of a Tour of the Hebrides, and Johnson's Diary of A Journey Into North Wales”, p.313