C.N. Douglas, comp. Forty Thousand Quotations: Prose and Poetical. 1917.
Metaphor
Figured and metaphorical expressions do well to illustrate more abstruse and unfamiliar ideas, which the mind is not yet thoroughly accustomed to.
Locke.
An epithet or metaphor drawn from nature ennobles art; an epithet or metaphor drawn from art degrades nature.
Johnson.
Metaphor gives light and strength to description.
John Brent.
Metaphor is no argument, though it be sometimes the gunpowder to drive one home, and imbed it in the memory.
Lowell.
Of metaphors, those generally conduce most to energy or vivacity of style which illustrate an intellectual by a sensible object.
Whately.