HOW CAN I HELP SEEING WHAT IS IN FRONT OF MY EYES? TWO AND TWO ARE FOUR!

This sentences are said by the main character of 1984, Winston Smith, while he is being tortured by O'Brien to tell him what he wants to hear, that  if the Party says two and two are five, he must say two and two are five.

Moreover, O'Brien wants to make him believe what he says, he tries to get inside his ead so that he can be "openminded" and he accepts everything the Big Brother says is true. So he keeps asking over and over te same question, making him suffer more and more pain everytime he said something "wrong".

In the end of the story, we can see how bad has Winston been changed, as he loves the Big Brother and even tears of emotion come to his eyes when he just sees his picture.