The bigger question of what to do with your life is one of these problems with a hard core. There are important problems at the center, which tend to be hard, and less important, easier ones at the edges. So as well as the small, daily adjustments involved in working on a specific problem, you'll occasionally have to make big, lifetime-scale

Instead of spending your time worrying about finding the right topic, you will spend your time actually working on your already existing interests and doing what is necessary to make informed decisions – reading, thinking and writing. By doing the work, you can trust that interesting questions will emerge. You might not know where you will end up

Passion and courage are almost impossible to control and can easily leave you feeling bad about yourself. It’s far easier to simply work at getting really good at something in demand, discovering how those skills can be applied to something else, and then testing your idea in a small way to see if it will pay.