"...those who live by mystery & charlatanerie, fearing you would render them useless by simplifying the Christian philosophy, the most sublime & benevolent, but most perverted system that ever shone on man, endeavored to crush your well earnt, & well deserved fame." - Thomas Jefferson to Joseph Priestley, Washington, 21 March 1801.
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(Source: http://www.monticello.org/site/jefferson/christianity-most-perverted-system-ever-shone-manquotation)