Answer:
Tolerance between religions.
Step-by-step explanation:
Treatise on Tolerance was written by French Philosopher Voltaire and got published in 1763. In the book he wrote about tolerance between religions and argues against the religious fanaticism of Jesuits. The books was written after the trial of Jean Calas, who was a protestant and had murdered his son to prevent his conversion to church, he was executed for this act. The prosecution had used false witnesses in this case. In the book he shows Catholic extremism.