
Statement from unpublished notes for the Preface to Opticks (1704) quoted in Never at Rest: A Biography of Isaac Newton (1983) by Richard S. Westfall, p. 643
Letter to George Keats (1818)
Letters (1817–1820)
Statement from unpublished notes for the Preface to Opticks (1704) quoted in Never at Rest: A Biography of Isaac Newton (1983) by Richard S. Westfall, p. 643
L24
Aphorisms (1765-1799), Notebook L (1793-1796)
“A poem should not mean
But be.”
"Ars Poetica", Collected Poems, 1917-1982 http://books.google.com/books?id=KI0ESFOvi5QC&q=%22A+poem+should+not+mean+But+be%22&pg=PA107#v=onepage (1985)