"Knowledge is the treasure of the mind, but discretion is the key to it, without which it is useless. The practical part of wisdom is the best."

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With the enormous and steady increase in the volume of our literature, we must rely more and more upon sympathetic selection, judicious editing, and the indexer who knows where to exercise discretion. Any simpleton can write a book, but it requires high skill to make an index.

— Rossiter Johnson