I buy something when I have conviction, and I sell it when I lose conviction ... As long as you have conviction in something, you sleep well at night. You don't need to worry about it ... The problem happens when you buy something where you don't have conviction, and now you're constantly just revisiting it. And first of all, that's mentally exhausting. Second, you're probably not going to get it right because you didn't spend the time to figure it out to the extent that it could be figured out. And thirdly, you're not going to put enough capital into it because, again, you don't have conviction. So, conviction is the foundation of investing.