The answer is:
Voltaire argued in this book that religious toleration had created no problems for England and Holland, and reminded governments that "all men are brothers under God."
French philosopher Voltaire published "Treatise on Tolerance on the Occasion of the Death of Jean Calas from the Judgment Rendered in Toulouse" in 1763. In his work he asks religious beliefs to accept and understand one another, and he also criticizes spiritual extremism.