Let us together seek, if you wish, the laws of society, the manner in which these laws are reached, the process by which we shall succeed in discovering them; but, for God’s sake, after having demolished all the a priori dogmatisms, do not let us in our turn dream of indoctrinating the people...let us not—simply because we are at the head of a movement—make ourselves into the new leaders of intolerance, let us not pose as the apostles of a new religion, even if it be the religion of logic, the religion of reason.
Pierre Proudhon, to Karl Marx