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Our toil is sweet with thankfulness, Our burden is our boon; The curse of earth's gray morning is The blessing of its noon.

John Greenleaf Whittier (2012). “Personal Poems, Complete Volume IV., the Works of Whittier: Personal Poems”, p.170, tredition
Our toil is sweet with thankfulness, Our burden is our boon; The curse of earth's gray morning is The blessing of its noon.