This is a talk that Bret Victor gave 7 years ago, and I’ve mentioned this talk in my Spanish-written gamedev blog, but it’s completely worth it to see it again.
“The most dangerous thought that you can have as a creative person is to think that you know what you’re doing. Because once you’re thinking you know what you’re doing, you stop looking around for other ways of doing things. And you stop being able to see other ways of doing things. You become blind.”