They have written volumes out of which a couplet of verse, a period in prose, may cling to the rock of ages, as a shell that survives a deluge. – Edward Bulwer Lytton

The adventitious beauty of poetry may be felt in the greater delight which a verse gives in happy quotation than in the poem. – Ralph Waldo Emerson, “Art”

I am now to offer some thoughts upon that sameness or familiarity which we frequently find between passages in different authors without quotation. This may be one of three things either what is called Plagiarism, or Imitation, or Coincidence. – James Boswell, “The Hypochondriack,” No.XXII, 1779

The present volume is the result of a taste for collecting poetical quotations, which beset me in the days of my nonage, now more than half a century ago…. I read the poets diligently, and registered, in a portable form, whatever I thought apposite and striking. – Henry G. Bohn, A Dictionary of Quotations from the English Poets, 1881