William Wordsworth, Dorothy Wordsworth, Ernest De Selincourt, Alan G. Hill, Chester Linn Shaver (1967). “The Letters of William and Dorothy Wordsworth: Volume VIII. A Supplement of New Letters”, p.51, Oxford University Press on Demand
Back to Methuselah pt. 1, act 1 (1921). This was a favorite quotation of Robert F. Kennedy's, and Edward M. Kennedy used it in his eulogy of Robert Kennedy.