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Lay not the plummet to the line; religion hath no landmarks; no human keenness can discern the subtle shades of faith.

Martin Farquhar Tupper (1849). “Tupper's Poetical Works: Proverbial Philosophy, A Thousand Lines, Hacterus ... : with a Portrait of the Author”, p.49
Lay not the plummet to the line; religion hath no landmarks; no human keenness can discern the subtle shades of faith.