It was not till I was in college that the idea of work finally broke free from the idea of making a living. Then the important question became not how to make money, but what to work on. Ideally these coincided, but some spectacular boundary cases (like Einstein in the patent office) proved they weren’t identical.
The rule about doing what you love assumes a certain length of time
The definition of work was now to make some original contribution to the world, and in the process not to starve. But after the habit of so many years my idea of work still included a large component of pain. Work still seemed to require discipline, because only hard problems yielded grand results, and hard problems couldn’t literally be fun. Surely one had to force oneself to work on them.
If you think something’s supposed to hurt, you’re less likely to notice if you’re doing it wrong. That about sums up my experience of graduate school.
How much are you supposed to like what you do? Unless you know that, you don’t know when to stop searching. And if, like most people, you underestimate it, you’ll tend to stop searching too early.