This is Randall Carter's webpage for PSYC 355, Language and Thought.
Natural gesticulation, such as commonly accompanies any lively talk, is a language of its own, more widespread even, than the language of words—as far, I mean, as it is independent of words and alike in all nations
--Arthur Schopenhauer, 1903
The field of psychology has learned a lot about gesture in the last century.
By browsing this site, you can figure out for yourself how this quote is inaccurate, although it's an impressive claim for its time.