“We all have a Monster within; the difference is in degree, not in kind.”
Source: The Monster of Florence
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Douglas Preston 5
American author 1956Related quotes
Source: 10 Productivity Tips From the King of Cashmere, Brunello Cucinelli https://medium.com/@om/10-productivity-tips-from-the-king-of-cashmere-brunello-cucinelli-79c9cf74d9de Medium, Om Malik, April 27, 2015

“We boil at different degrees.”
Eloquence
1870s, Society and Solitude (1870)

Federalist No. 10
1780s, Federalist Papers (1787–1788)

“We have imported a monster and this monster is called Islam.”
As quoted in "‘We have imported a monster called Islam’: Dutch Far-Right leader Geert Wilders says EU should refuse entry to all Muslim migrants" http://www.dailymail.co.uk/news/article-3708401/Dutch-Far-Right-Freedom-Party-leader-Geert-Wilders-says-EU-refuse-entry-Muslim-migrants.html by Gareth Davies, Mail Online (26 July 2016)
2010s