Work is the collision between our internal selves and reality.
Sometimes it’s easy, sometimes it’s hard. Either way, it’s necessary for anything to get done, whether that is shipping a widget, an idea, or learning something new.
Proposition: Sitting in a lecture isn’t work. Writing the paper or doing the problem set – that’s work. Passive is to not-work as active is to work.
Corollary: passive is to not-learning as active is learning.