Isaac Barrow (1734). “The Usefulness of Mathematical Learning Explained and Demonstrated: Being Mathematical Lectures Read in the Publick Schools at the University of Cambridge”, p.28
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.
Albert Einstein (2015). “Bite-Size Einstein: Quotations on Just About Everything from the Greatest Mind of the Twentieth Century”, p.32, St. Martin's Press
Albert Einstein (2015). “Bite-Size Einstein: Quotations on Just About Everything from the Greatest Mind of the Twentieth Century”, p.32, St. Martin's Press
John von Neumann's remarks as keynote speaker at the first national meeting of the Association for Computing Machinery (1947) as quoted in "Archaeology of computers: Reminiscences, 1945-1947" by Franz L. Alt, Communications of the ACM, Volume 15, Issue 7, special issue: Twenty-fifth anniversary of the Association for Computing Machinery (p. 694), July 1972.