Often attributed to Plato, it cannot be found in any of his writings ( see this http://languagelog.ldc.upenn.edu/nll/?p=796). The quote is attributed to Plato in A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern (page 560) by Tryon Edwards.
Misattributed
“As empty vessels make the loudest sounds, so they that have the least wit are the greatest babblers.”
Often attributed to Plato, it cannot be found in any of his writings. http://languagelog.ldc.upenn.edu/nll/?p=796
Misattributed
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Plato 80
Classical Greek philosopher -427–-347 BCRelated quotes
“639. Emptie vessels sound most.”
Jacula Prudentum (1651)
“The Lord bestows his blessings there, where he finds the vessels empty.”
Source: The Imitation of Christ
“Empty heads make the best drums. And the emptier the head, the fuller the sound.”
Auf hohlen Köpfen ist gut trommeln. Und je hohler ein Kopf, desto voller das Echo.
Acceptance speech on receiving the Alternative Büchner Prize, 1993. MIZ - Materialien und Informationen zur Zeit. ISSN 0170-6748, Heft 3, 1993, ibka.org http://www.ibka.org/artikel/miz93/preis.html
Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995)