Your coworker disappeared because the Party gave him a surprise 2 week vacation. The students whom the Party's tanks machine-gunned in Tiananman Square were dangerous radicals who were a threat to your safety. Your country is at war with Eurasia Eastasia. Your country has always been at war with Eastasia. War is peace.
Freedom is slavery.
Ignorance is strength. Two and two make five. All animals are equal, but some animals are more equal than others. The pigs really need to eat all the apples and drink all the milk to keep Farmer Jones from returning. Four legs good, two legs better.