Leo Tolstoy (graf) (1905). “The Complete Works of Count Tolstoy: Walk in the light while ye have light; Thoughts and aphorisims; Letters; Miscellanies”
Henry Beston, Elizabeth Jane Coatsworth (2001). “The Best of Beston: A Selection from the Natural World of Henry Beston from Cape Cod to the St. Lawrence”, p.19, David R. Godine Publisher
Quoted in Humphrey Carpenter, W. H. Auden (1981). Leonard L. Levinson, in Bartlett's Unfamiliar Quotations (1971), quotes this comment as being said about Auden by someone else.