What is significant about the young pigs being educated?

Napoleon firmly believes that pigs are massively superior to all the other animals on the farm. He thinks they are smarter, more hardworking, and most of all, more committed to the ultimate victory of Animalism than any other species. It's vitally important, then, for the young pigs to be educated—or more accurately speaking, indoctrinated—in order for them to live up to their noble calling.
Napoleon is chronically insecure about the foundations of the pigs' rule over the farm. This is one reason why he seeks to cement his dictatorship by terror and repression. He wants the Animalist revolution to be built on firmer foundations so that it will survive long into what he believes will be a glorious future. To do this, he needs to shape the minds of the next generation of rulers so they will be able to carry on his legacy.