Tl;dr: According to an anecdote by the speaker Denis Waitley An experiment was made by the North Koreans, during the Korean War, to separate American POWs into purposeful from the purposeless,

The ones 'with no hopes and dreams', who were mostly in the minimum security 'camp country camps' , would have a higher death and disease rate than even the ones in the max. security camps, who were beaten and tortured as the story goes...

The purposeful ones had many goals, but the main one was survival and reaching home.

Idk if Denis Waitley, the speaker, pulled this info from his ass, but I'm pretty sure regardless of if you had a driving force or not, that the main objective of the North Koreans was to survive getting bombed to the stone age by the United States