
“Thy liquid notes that close the eye of day.”
Sonnet to the Nightingale, reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "That well by reason men it call may / The daisie, or els the eye of the day, / The emprise, and floure of floures all", Geoffrey Chaucer, Prologue of the Legend of Good Women, line 183