Thomas Hardy (1840-1928), Tess of the d'Urbervilles: A Pure Woman
, chapter III:
All these young souls were passengers in the Durbeyfield ship—entirely dependent on the judgement of the two Durbeyfield adults for their pleasures, their necessities, their health, even their existence. If the heads of the Durbeyfield household chose to sail into difficulty, disaster, starvation, disease, degradation, death, thither were these half-dozen little captives under hatches compelled to sail with them—six helpless creatures, who had never been asked if they wished for life on any terms, much less if they wished for it on such hard conditions as were involved in being of the shiftless house of Durbeyfield. Some people would like to know whence the poet whose philosophy is in these days deemed as profound and trustworthy as his song is breezy and pure, gets his authority for speaking of 'Nature's holy plan.'
The poet is William Wordsworth, and the phrase comes from his "Lines Written in Early Spring," line 22.