Among the order of the white penitents there were some magistrates of justice; the death of John Calas seemed then inevitable.

But what more particularly hastened his fate was the approach of that singular festival, which, as I have already observed, the Toulousians celebrate every year, in commemoration of the massacre of four thousand Huguenots; the year 1762 happened to be the _annum seculare_ of this execrable deed. The inhabitants were busied in making preparations for the solemnity; this circumstance added fresh fuel to the heated imagination of the populace; every one cried out that a scaffold for the execution of the Calas family would be one of the greatest ornaments of the ceremony; and that heaven itself seemed to have brought them thither as victims, to be sacrificed to our holy religion. Twenty persons were ear-witnesses to these speeches, and to others still more outrageous. And this, in the present age! this at a time when philosophy has made so great a progress! and while the pens of a hundred academies are employed in inculcating humanity and gentleness of manners. It should seem that enthusiasm enraged at the late success of reason, fought under her standard with redoubled fury.

The Works of Voltaire, Vol. IV of XLIII — Part 63

Thirteen judges met every day to try this cause; they had not, they could not, have any proof against this unhappy family; but mistaken zeal held the place of proofs. Six of the judges continued a long time obstinate, being resolved to sentence John Calas, his son, and Lavaisse, to be broken on the wheel, and his wife to be burned at the stake; the other seven judges, rather more moderate, were at least for having the accused examined; the debates were frequent and long. One of the judges, convinced in his mind of the innocence of the parties, and of the impossibility of the crime laid to their charge, spoke warmly in their favor; he opposed the zeal of humanity to that of cruelty, and openly pleaded the cause of the Calas family in all the houses of Toulouse where misguided religion demanded with incessant cries the blood of these unfortunate wretches. Another judge, well known for his violence and severity, went about the town, raving with as much fury against the accused as his brother had been earnest in defending them. In short, the contest became so warm that both were obliged to enter protests against each other’s proceedings, and retire into the country.

The Works of Voltaire, Vol. IV of XLIII — Part 63