If I Have Ever Made Any

This sentiment is attributed to Newton in several 19th-century sources, with close variants appearing in David Brewster's Memoirs of Sir Isaac Newton (1855). The wording in early sources reads "owing more to patient attention" rather than "due more," and the remark is consistent with Newton's known working methods: he reportedly spent years quietly accumulating observations before publishing, holding his work on calculus for decades and his Principia Mathematica for nearly twenty years after first developing its core ideas.