When you feel confused while reading a book, it's similar to…

When you feel confused while reading a book, it's similar to when your muscles get sore or fatigued during exercise. Except this time it's your brain hitting its limit and getting overloaded instead of your body.

But since it's a process of struggling to acquire new concepts at the edge of your ability, you'll become smarter in the long run.

It's good to willingly accept things that are hard right now but beneficial in the long term.

Q. What's the most efficient way to build a new mental model?

It's reading a lot. Just read.

— Naval Ravikant