Songs of Innocence and Songs of ExperienceThe Marriage of Heaven and HellOnce a dream did weave a shade O’er my angel-guarded bed, That an emmet lost its way Where on grass methought I lay. Troubled, wildered, and forlorn, Dark, benighted, travel-worn, Over many a tangled spray, All heart-broke, I heard her say: ‘ O my children! do they cry, Do they hear their father sigh? Now they look abroad to see, Now return and weep for me.’