Diogenes Laertius quotes Chilōn of Sparta (c. 560 B.C.E.):
λέγοντα μὴ κινεῖν τὴν χεῖρα: μανικὸν γάρ.
Gesticulation in speaking should be avoided as a mark of insanity.
Diogenes Laertius, Lives of Eminent Philosophers I, ed. R.D. Hicks, Loeb Classical Library 184 (Cambridge, Mass.: Harvard University Press, 1925[1972]), p 73. On line at the Perseus Digital Library (accessed 20140818).
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