Quoted in Christian Monitor, and Religious Intelligencer, 4 July 1812. An almost identical quotation by Newton, said to have been uttered "a little before he died," appears in Joseph Spence, Anecdotes, Observations, and Characters of Books and Men, published in 1820 but extant in manuscript form from around 1730. A paraphrase of Newton's words was printed in a note in a 1797 edition of TheWorks of Alexander Pope.
Francis Thackeray, William Pitt (1827). “A history of the Right Honorable William Pitt, Earl of Chatham: containing his speeches in Parliament : a considerable portion of his correspondence, when Secretary of State, upon French, Spanish, and American affairs, never before published with an account of the principal events and persons of his time, connected with his life, sentiments and administrations ; (Mit dem Bildnisse Pitts)”, p.327
Irvin S. Cobb, Mary Roberts Rinehart, Helen Rowland, Richard Saunders (2017). “We Should All Be So Feminine: We Should All Be a Feminist: We Should All Be Feminists”, p.53, Lulu.com