Plato, George Washington, and "Justice is the firmest pillar of good government"

[bapopik at AOL.COM]

http://www.barrypopik.com/article/827/the-true-administration-of-justice-is-the-firmest-pillar-of-good-government
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This is the motto on the New York County Courthouse. The actual letter is in the American Memory database. Fred Shapiro probably recorded it (for his legal quotations book)_ or will record it (for his quotations book).
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What are the sources in Plato? Are there any? Obviously, that would be in Greek, but any good translation is fine for something at all close.
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(GOOGLE)
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Ravi Zacharias International Ministries (RZIM)
... Was it not Plato who said that justice is the firmest pillar of good government?
His student Aristotle went even further. He said: "Justice is not part ...
www.rzim.org/publications/slicetran.php?sliceid=684 - 14k - Cached - Similar pages
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The Problem of Violence
... II. How Long Must I Look At This Injustice? A. Plato said: "Justice is the firmest
pillar of good government.". 1. If justice crumbles, government is destroyed. ...
wschurchofchrist.org/Sermons/violence.html - 24k - Supplemental Result - Cached - Similar pages