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I slept, and dreamed that life was Beauty; I woke, and found that life was Duty. Was thy dream then a shadowy lie? Toil on, poor heart, unceasingly; And thou shalt find thy dream to be A truth and noonday light to thee.

"Life a Duty". "Bartlett's Familiar Quotations", 10th edition, 1919.
I slept, and dreamed that life was Beauty; I woke, and found that life was Duty. Was thy dream then a shadowy lie? Toil on, poor heart, unceasingly; And thou shalt find thy dream to be A truth and noonday light to thee.