"The loud little handful -- as usual -- will shout for the war. The
   pulpit will -- warily and cautiously -- object... at first. The great,
   big, dull bulk of the nation will rub its sleepy eyes and try to make
   out why there should be a war, and will say, earnestly and indignantly,
   'It is unjust and dishonorable, and there is no necessity for it.' Then
   the handful will shout louder. A few fair men on the other side will
   argue and reason against the war with speech and pen, and at first will
   have a hearing and be applauded, but it will not last long; those
   others will outshout them, and presently the antiwar audiences will
   thin out and lose popularity. Before long, you will see this curious
   thing: the speakers stoned from the platform, and free speech strangled
   by hordes of furious men... Next the statesmen will invent cheap lies,
   putting the blame upon the nation that is attacked, and every man will
   be glad of those conscience-soothing falsities, and will diligently
   study them, and refuse to examine any refutations of them; and thus he
   will by and by convince himself that the war is just, and will thank
   God for the better sleep he enjoys after this process of grotesque
   self-deception."
Chapter 9 of "The Mysterious Stranger" (1910?), by Mark Twain. Apparently this is Satan speaking to the author.