Working hard for yourself is way easier than working hard for others.
This is the most easily seen between entrepreneurship and a salaried position.
But pulling it off at the office is a step above.
Where a typical manager may set the deadline for the employee, Musk guides his engineers into taking ownership of their own delivery dates. “He doesn’t say, ‘You have to do this by Friday at two P.M.,’” Brogan said. “He says, ‘I need the impossible done by Friday at two P.M. Can you do it?’ Then, when you say yes, you are not working hard because he told you to. You’re working hard for yourself. It’s a distinction you can feel.
-Ashley Vance, Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future (Amazon)