I have heard that nothing gives an Author so great Pleasure, as to find his Works respectfully quoted by other learned Authors. – Benjamin Franklin, “Preface,” Poor Richard Improved, wording verified by Respect

Every book is a quotation; and every house is a quotation out of all forests and mines and stone quarries; and every man is a quotation from all his ancestors. – Ralph Waldo Emerson, “Plato; Or, The Philosopher”

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

In these pages the novelist should be able to find a striking verse to head his chapter, the raconteur add to his bon mots, the man of the world enrich his stock of maxims, the divine obtain some deep thought drawn from the wells of ancient learning. – William Francis Henry King, “Introduction,” Classical and Foreign Quotations, 18