A vast meaning is unfolded in each line, with such power that a sentence only a line long would suffice for a whole life’s training. – Rufinus (translated from Latin), about The Sentences of Sextus

There are but few proverbial sayings that are not true, for they are all drawn from experience itself, which is the mother of all sciences. – Miguel de Cervantes

All quotation dictionaries stand on the shoulders of their predecessors, which must be consulted as part of the effort to make sure that no famous quotations are missed. – Fred R. Shapiro, The Yale Book of Quotations, 2006 (Acknowledgements)

I am reminded of the professor who, in his declining hours, was asked by his devoted pupils for his final counsel. He replied, Verify your quotations. – Sir Winston Churchill