Mr. [Thomas] Gray the poet has often observed to me that if a man were to form a Book of what he had seen and heard himself it must in whatever hands prove a most useful and entertaining one. – Horace Walpole, quoted in Walpoliana, 1800

A fine quotation is a diamond on the finger of a man of wit, and a pebble in the hand of a fool. – Joseph Roux (1834–1905), Meditations of a Parish Priest, 1886, translated

Nothing ever becomes real till it is experienced—even a Proverb is no proverb to you till your Life has illustrated it. – John Keats, letter to George and Georgiana Keats, February 24, 1819

Quotation, like much better things, has its abuses. One may quote till one compiles. The ancient lawyers used to quote at the bar till they had stagnated their own cause. – Isaac D’Israeli, “Quotation,” A Second Series of Curiosities of Literature