Power's "amplest, best Extent" is "An Empire o'er [one's] Mind"

— Richardson, Samuel (bap. 1689, d. 1761)

Place of Publication
Printed for S. Richardson
Power's "amplest, best Extent" is "An Empire o'er [one's] Mind"
Metaphor in Context
VI.Not Fortune's Gem, Ambition's Plume,
Nor Cytherea's fading Bloom,
  Be Objects of my Pray'r:
Let Av'rice, Vanity, and Pride,
Those envy'd glitt'ring Toys divide,
  The dull Rewards of Care.

VII.To me thy better Gifts impart,
Each moral Beauty of the Heart,
  By studious Thought refin'd;
For Wealth, the Smiles of glad Content,
For Pow'r, its amplest, best Extent,
  An Empire o'er my Mind.

(Volume II, Letter 9)
Searching "empire" and "mind" in HDIS (Prose)
Published December 1747 (vols. 1-2), April 1748 (vols. 3-4), December 1748 (vols. 5-7). Over 28 entries in ESTC (1748, 1749, 1751, 1751, 1759, 1764, 1765, 1768, 1772, 1774, 1780, 1784, 1785, 1788, 1790, 1791, 1792, 1794, 1795, 1798, 1800). Passages "restored" in 3rd edition of 1751. An abridgment in 1756.

See Samuel Richardson, Clarissa. Or, the History of a Young Lady: Comprehending the Most Important Concerns of Private Life, 7 vols. (London: Printed for S. Richardson, 1748). <Link to ECCO>

Some text drawn from ECCO-TCP <Link to vol. I in ECCO-TCP><Link to vol. II><Link to vol. III><Link to vol. IV><Link to vol. V><Link to vol. VI><Link to vol. VII>

Reading Samuel Richardson, Clarissa; or, the History of a Young Lady, ed. Angus Ross (London: Penguin Books, 1985). <Link to LION>
Date of Entry

The Mind is a Metaphor is authored by Brad Pasanek, Assistant Professor of English, University of Virginia.