A large association of ignorant men can not for any considerable period oppose a successful resistance to tyranny and oppression from the educated few, but will inevitably sink into acquiescence to the will of intelligence, whether directed by the demagogue or by priestcraft.
 Ulysses S. Grant, State of the Union Address. copy citation

Context

“We are a republic whereof one man is as good as another before the law. Under such a form of government it is of the greatest importance that all should be possessed of education and intelligence enough to cast a vote with a right understanding of its meaning. A large association of ignorant men can not for any considerable period oppose a successful resistance to tyranny and oppression from the educated few, but will inevitably sink into acquiescence to the will of intelligence, whether directed by the demagogue or by priestcraft. Hence the education of the masses becomes of the first necessity for the preservation of our institutions. They are worth preserving, because they have secured the greatest good to the greatest proportion of the population of any form of government yet devised.” source