Doubt stops more plans than a shortage of money ever has, and Łukasz Łokieć goes after it directly and at volume. He writes in capitals, addresses you as if you were in the room, and refuses to let a post end without asking you to do something.
What saves it from being noise is that he names his sources. A body builder turned actor from a small Austrian town gets a whole post as evidence that a background predicts nothing. The Batman films get read for four lessons about failure. Muhammad Ali and Napoleon Hill get quoted, and the quotations are chosen rather than scraped.
The most useful piece is a four step method for finding a mentor, which is practical where the rest is rousing. There is also a good post arguing that excuses can be made to work in your favour, which is a stranger idea than it sounds.
Twenty six posts, all short and loud. If your problem is genuinely a shortage of belief rather than a shortage of information, start with the doubt one.