Reframing an extract as a quotation constitutes a kind of coauthorship. With no change in wording, the cited passage becomes different. I imagine that the thrill of making an anthology includes the opportunity to become such a coauthor. – Gary Saul Morson, The Words of Others: From Quotations to Culture, 2011

One is more apt to become wise by doing fool things than by reading wise sayings. – Robert Brault, rbrault.blogspot.com

What a good thing Adam had — when he said a good thing, he knew nobody had said it before. – Mark Twain, 1867

The profoundest thought or passion sleeps as in a mine, until an equal mind and heart finds and publishes it. – Ralph Waldo Emerson, “Quotation and Originality,” Letters and Social Aims, 1876