You might want to examine the _expert_ part of that statement. What exactly does that mean to you? I have a great many interests, and I shift to focusing betwe

You might want to examine the _expert_ part of that statement. What exactly does that mean to you? I have a great many interests, and I shift to focusing between them pretty regularly (and have for many years). I enjoy all of them, but I likely won’t make any meaningful impact or win an award or have people ask my opinion in any of them. I only do them because I enjoy them. If you’re truely honest, your lifetime isn’t enough to truly know anything - one subject or many subjects. You’ll pass away, and all your work will be forgotten in time eventually - no matter what. Life is impermanent. So, my random internet advice: if you find one subject you really like, go deep. If you have a lot of interests, go wide. If you want a fancy job and people to fawn over how intelligent you are, be born rich.