Take a few minutes to watch this animation explaining the idea behind the book The Antidote: Happiness for People Who Can't Stand Positive Thinking from Oliver Burkeman. While it's definitely an advertisement for his book, it's also a bit of education on the idea that embracing Positive Thinking can lead to premature reward, causing you to stop striving for your actual goals. Even if you don't agree with the message, the animations from Scriberia are top notch and more than worth your time.