The text of this poem has been corrected against
- "Life of William Blake", by Alexander Gilchrist, D. G. Rossetti, W. M. Rossetti, Anne Gilchrist, 1863 (1880). Rossetti renamed this poem to "Opportunity" and added "If you trap the moment before its ripe..." to it as the second quatrain. p. 126 (1880). W. B. Yeats copied this precisely in his edition of "Poems of William Blake".
- "Blake Complete Writings", ed. Geoffrey Keynes, pub. OUP 1966/85, p. 179.
- "The Complete Poetry & Prose of William Blake", ed. by David V. Erdman, Anchor Books, 1988, p. 470