"When we work, we do it because we are obligated to. We work for food because
we are slaves to our bellies. We work to pay the rent because we are slaves to our
safety and comfort. Some of this servitude is willing servitude, such as willingness
to earn money to care for our families, but it is servitude nonetheless. We are doing
it because we have to, not because “we feel like it.” The more obligated you are to do
something, the more it feels like work. The less obligated you are to do something,
the more it feels like play. Stated differently, “It is an invariable principle of all play
… that whoever plays, plays freely. Whoever must play cannot play.”

- Jesse Schell