I suppose every old scholar has had the experience of reading something in a book which was significant to him, but which he could never find again. Sure he is that he read it there; but no one else ever read it, nor can he find it again, though he buy the book and ransack every page. – Ralph Waldo Emerson

I can tell thee where that saying was born… – William Shakespeare, Twelfth Night [I, 5, Maria]

Many moons ago dictionaries of quotations may have been less needed than they are today. In those good/bad old days, people walked around with entire poems and all the Shakespearean soliloquies in their heads…. – Joseph Epstein, Foreword to Fred R. Shapiro’s Yale Book of Quotations, 200

I never have found the perfect quote. At best I have been able to find a string of quotations which merely circle the ineffable idea I seek to express. – Attributed to Caldwell O’Keefe in The Trademark Reporter, Vol.93, 2003