This goal is achieved in a number of ways:
- First, the state engineers the people to have levels of intelligence that match the work that they will do. That way, you don't have really smart people having to do mindless work and, therefore, being unhappy with their lives.
- Second, there is all the conditioning that goes on throughout their lives. The people have ideas drummed into their heads as they sleep -- things like the idea that their caste is best and it would be miserable to be of another caste.
- Third, there is soma and other drugs. People are drugged to make calm them down and to make sure their emotions don't get out of control.
- Finally, there is sex and various sports. These are meant to make sure that people are always occupied doing physical stuff. They don't have to sit around idle, thinking about things that might make them unhappy.