Men who are orthodox when they are young are in danger of being middle-aged all their lives.

The radical novelty of modern science lies precisely in the rejection of the belief... that the forces which move the stars and atoms are contingent upon the preferences of the human heart.

Very few established institutions, governments and constitutions ...are ever destroyed by their enemies until they have been corrupted and weakened by their friends.

The time has come to stop beating our heads against stone walls under the illusion that we have been appointed policeman to the human race.

Without some form of censorship, propaganda in the strict sense of the word is impossible. In order to conduct propaganda there must be some barrier between the public and the event.

In making the great experiment of governing people by consent rather than by coercion, it is not sufficient that the party in power should have a majority. It is just as necessary that the party in power should never outrage the minority.

The only feeling that anyone can have about an event he does not experience is the feeling aroused by his mental image of that event ... For it is clear enough that under certain conditions men respond as powerfully to fictions as they do to realities.