1984 Final

The doctrine O’Brien proclaims to Winston in this passage plays a very important role in maintaining the system of oligarchical collectivism upon which INGSOC is based on and in Winston’s ultimate fate at the close of the novel. The doctrine explains that humankind can only work well if they work together and the only way that they can do that is if they have the same beliefs. The Party believes that humans cannot have the same beliefs unless they have a basic "doctrine." They takes advantage of this idea and compose the doctrine so that all their beliefs benefit the Party. Furthermore, O'Brien uses this doctrine to show why Winston's fate at the end is the only way he would be restored to "sane."
The Party believes that "the individual mind" can make mistakes therefore they want the citizens to unite and have the same beliefs. It's ironic that they're using something good like unity and twisting it to fit their doctrine and Party platform. The Party stresses the idea of humility and being humble. They want their citizens to believe that humility shows strength in being able to cooperate and work with one another. It seems as if the Party believes that if people had individual minds and their own beliefs, it wouldn't be possible to have a collected community but everything would fall and crumble. The Party's desperate need for power is clearly shows in this doctrine. They want their citizens to do as they say and even believe what they want them to believe. Even today, we will be put in positions where we have to follow a leader and follow directions whether we like them or not, but never are our beliefs affected by this. Today we have the freedom to believe in what we want to believe in, and as far as it doesn't cause anyone any harm, we can make these beliefs known.
"Not in the individual mind, which can make mistakes, and in any case soon perishes; only in the mind of the Party, which is collective and immortal." This sentence clearly shows why Winston was put to death and how this will help the Party maintain their "sane" citizens under their "sane" doctrine. They believe that people soon die and their beliefs die with them, but if their beliefs are shared with everyone else under the same doctrine then these beliefs live forever. They push Winston so far by torturing him with his worst fear that he begins to believe what the Party wants him to believe. In this doctrine, O'Brien tells Winston that he has to "relearn" everything he used to know before.