from snopes: http://www.snopes.com/politics/soapbox/williams.asp

Appearantly the only part of this that is from Robin Williams is the part about the statue of liberty at the end.

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But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty;
1 Corinthians 1:27