Focus
People who have made big contributions to the world, have done so with their focus on the single objective. They sacrificed or were willing to sacrifice everything else to achieve that single objective. Think about MLK, Gandhi, Mother Teresa, etc.
Most people want to do multiple things in life and hence most people do not make extraordinary and big contributions to the world.
Most people want to do multiple things in life and hence most people do not make extraordinary and big contributions to the world.