Can you simply "whistle while you work" and ignore poor circumstances?

Researchers at the Australian National University have revealed that people working a demanding job without having job security or fair pay got significantly (p<0.05) lower mental health scores than people who just stayed unemployed. However, those who traded unemployment for a high-quality job increased their mental health scores. 

PositiveTip: Circumstances certainly influence our mental health, but attitudes do too. We can always find people in the worst circumstances with wonderfully positive attitudes. How is your outlook?