|The Great Train Robbery|
Allowing for cultural exceptions, such as the Protestant Work Ethic, labor is most often motivated by the desire to satisfy physical  needs. We don't like to be hungry or cold or thirsty or standing wet in the rain or being unprotected from human enemies and predatory wild things. Human nature, being what it is, we try to find shortcuts (not always a good thing) and efficiencies (usually good), or when we can get by with it, not work at all. But working is not always necessary, particularly in rich societies where stealing may be an attractive alternative.