"It has been said that terror is the principle of despotic government. Does your government therefore resemble despotism? Yes, as the sword that gleams in the hands of the heroes of liberty resembles that with which the henchmen of tyranny are armed. Let the despot govern by terror his brutalized subjects; he is right, as a despot. Subdue by terror the enemies of liberty, and you will be right, as founders of the Republic. The government of the revolution is liberty's despotism against tyranny."
"It has been said that terror is the principle of despotic government. Does your government therefore resemble despotism? Yes, as the sword that gleams in the hands of the heroes of liberty resembles that with which the henchmen of tyranny are armed. Let the despot govern by terror his brutalized subjects; he is right, as a despot. Subdue by terror the enemies of liberty, and you will be right, as founders of the Republic. The government of the revolution is liberty's despotism against tyranny."
What is that from?
Robespierre - On Political Morality
https://www.marxists.org/history/france/revolution/robespierre/1794/political-morality.htm