“Passion and prejudice govern the world; only under the name of reason.”

“Men are rather reasoning than reasonable animals, for the most part governed by the impulse of passion.”

“Reason is, and ought only to be the slave of the passions.”

“In this world the only opinion that holds court is prejudice.”

“To spread healthy ideas among even the lowest classes of people, to remove men from the influence of prejudice and passion, to make reason the arbiter and supreme guide of public opinion; that is the essential goal of the sciences; that is how science will contribute to the advancement of civilization, and that is what deserves protection of governments who want to insure the stability of their power.”

“Virtue is not always amiable. Integrity is sometimes ruined by prejudices and by passions.”

“Why has government been instituted at all? Because the passions of men will not conform to the dictates of reason and justice, without constraint.”

“While the passion of some is to shine, of some to govern, and of others to accumulate, let one great passion alone influence our breasts, the passion which reason ratifies, which conscience approves, which Heaven inspires, — that of being and doing good.”

“Seduction and attraction carry your name. You are my obsession, you are in the world to be my greatest passion.”

“He only employs his passion who can make no use of his reason.”