Confirmation that my PhD is hard enough
The best protection is always to be working on hard problems. Writing novels is hard. Reading novels isn't. Hard means worry: if you're not worrying that something you're making will come out badly, or that you won't be able to understand something you're studying, then it isn't hard enough.— Paul Graham, What You'll Wish You'd Known
I worry a lot, so I guess I can perhaps take consolation that my phd is a worthwhile problem. Two of my four great concerns at the moment are that the project does not contribute to society and that I am not capable of solving it.