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I am always suspicious of one who considers himself to be wise.

sophist 1542, earlier sophister (c.1380), from L. sophista, sophistes, from Gk. sophistes, from sophizesthai "to become wise or learned," from sophos "wise, clever," of unknown origin. Gk. sophistes came to mean "one who gives intellectual instruction for pay," and, contrasted with "philosopher," it became a term of contempt. Ancient sophists were famous for their clever, specious arguments.

philosopher O.E. philosophe, from L. philosophus, from Gk. philosophos "philosopher," lit. "lover of wisdom," from philos "loving" + sophos "wise, a sage." "Pythagoras was the first who called himself philosophos, instead of sophos, 'wise man,' since this latter term was suggestive of immodesty." [Klein] Modern form with -r appears c.1325, from an Anglo-Fr. or O.Fr. variant of philosophe, with an agent-noun ending. . . .