The wisdom of mankind creeps slowly on,
Subject to every doubt that can retard
Or fling it back upon an earlier time.

Source and credibility

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Source: Orion (1843), Book iii, Canto ii.
Work: Orion, 1843
Source quality: Precise citation Points to a specific work with a page, chapter, date or similar locator, so you can look it up.

The Plough: Quoted in Hoyt's New Cyclopedia Of Practical Quotations (1922)

Orion (1843)

Orion (1843)

Dirge; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922)

The Laurel Seed; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922)

Genius; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922)

Quote text and notes from Wikiquote: Richard Henry Horne (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.