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At first Napoleon believes that all of the animals need some type of education, but that soon changes as the he and other pigs realize that intelligence is what will keep them in control of the other animals. Thus, they begin to use what they believe to be their "superior intelligence," as a form of oppression.
The pigs teach themselves to read and write from a children's book; Napoleon then has it destroyed and he adjusts the seven commandments at will because nobody else can read them. His use of "educating" the other animals is limited to animals he can use for his own purposes; ie, the puppies who become the secret police.