"And while good books - even so-so books - serve both functions, if you ever have to choose one over the other, keep in mind that a book that entertains without enlightening can still be a guilty pleasure, but a book that enlightens without entertaining is algebra."

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Why is it that Serge Lange's Linear Algebra, published by no less a Verlag than Springer, ostentatiously displays the sale of a few thousand copies over a period of fifteen years, while the same title by Seymour Lipschutz in the The Schaum's Outlines will be considered a failure unless it brings in a steady annual income from the sale of a few hundred thousand copies in twenty-six languages?

— Gian-Carlo Rota