Source, in full
As quoted in The Life and Letters of Faraday (1870) Vol. II, edited by Henry Bence Jones, p. 483; also engraved above the doorways of the Pfahler Hall of Science at Ursinus College in Collegeville, Pennsylvania (see photo).
More quotes by Michael Faraday
Attribution
Quote text and notes from Wikiquote: Michael Faraday (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.