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John Bartlett (1820–1905). Familiar Quotations, 10th ed. 1919.

10418 Appendix John Bartlett

QUOTATION:Beware of a man of one book.
ATTRIBUTION:When St. Thomas Aquinas was asked in what manner a man might best become learned, he answered, “By reading one book.” The homo unius libri is indeed proverbially formidable to all conversational figurantes.—Robert Southey: The Doctor, p. 164.