He who does not know how to dissemble, knows not how to reign.
Notes from Wikiquote
Reported in Hoyt's New Cyclopedia of Practical Quotations (1922) as "He who knows not how to dissimulate, can not reign."
Quote text and notes from Wikiquote: Louis XI (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.