Everyone who’s worked on difficult problems is probably familiar with the phenomenon of working hard to figure something out, failing, and then suddenly seeing the answer a bit later while doing something else.
Most people have one top idea in their mind at any given time, which means it’s a disaster to let the wrong idea become the top one in your mind.
There are two types of thoughts worth avoiding: thoughts about money and disputes.
I suspect a lot of people aren’t sure what’s the top idea in their mind at any given time. But it’s easy to figure this out: just take a shower. What topic do your thoughts keep returning to? If it’s not what you want to be thinking about, you may want to change something.