I think I saw it somewhere more times, maybe the first time in GQ-related materials. No book/source in particular.

I hope he at least got a warning from the principal because of that. I don't see how he's a helpful role model/authority, if he's tolerated to yell at students. I think it's fair to slog it out at this high school until you finish it and pass the finals. Once you're 18/19, you're free to call your own shots. Looking back, I'd not get into the university, had I not had a particular reason to study (I wanted to be an army officer, so I had to go to the uni for that). I don't think it's helpful to go to the university for a completely random degree and I think working a few jobs to try out what fits is better (plus you'll get a stable income). I earned money since I was 19 (I also finished a university, but as a side project), but over the years (now I'm 27), I've built up a considerable reserve. It's really a big difference if you start work at 18/19, or after a degree at 22/25. There's data that uni people earn more, but I think it's just a correlation without causation and that the people would do well even without a degree. Plus, you can always do the degree later, if it's something you really want or need to advance your career. Feel free to ask more about my reasoning if you want 😄 

Thanks for the advice @Ikar! An update: I went to my math teacher today because he made a mistake on the test and I talked to him about it and how I deserve to get that question right. Unfortunately, he became enraged and yelled at me because I had bruised his ego. And funnily enough, the principal was sitting in his classroom which goes to show that he is indeed mentally ill and it is not my problem at all. I can't believe how 99% of students can put up with him acting like he's the king of this school.

Entry 21.1 Day 6: No Useless Videos Day 838: Sticking to Food schedule Day 441: Eating Only between 06:30 and 19:00 (Last bite before 19:00) Day 11: Being in bed before 23:15 3 Things I did well no matter how small  -Morning Jog -7 pomodoros -sticking to about 40 minutes during apartment conversation which is within the timeframe i devoted to it 1 Thing I could do  better -Planned contingencies for poop, if there's no sun Gaming count since relapse  Gaming (Death, Slavery, Regret, Disease) - 5  Yan (Life, Individuality, Freedom, Purpose, Self-Fulfillment) - 8

Did you find that quote in Johann Hari's "Chasing the scream"? Or from another source? Would you suggest that book if you got it from there?