Alexander Pope Quotes about Gratitude

Alexander Pope, Alexander Chalmers (1807). “A Supplementary Volume to the Works of Alexander Pope, Esq: Containing Pieces of Poetry, Not Inserted in Warburton's and Warton's Editions : and a Collection of Letters, Now First Published”, p.121
Alexander Pope, Alexander Dyce (1856). “The Poetical Works of Alexander Pope”, p.57
'An Essay on Man' Epistle 4 (1734) l. 1