As I discussed previously, you can leverage pain and pleasure to change your responses to experiences and to alter your behavior to become the person you want to be.
Direct physical pleasure and pain are the quickest way to achieve this. If you get burned by something hot or you get a rush from a roller-coaster, you won't forget it.
The second way to achieve similar results is with language. Our brains are built to symbolically represent the world we live in, and a language is the agreed translation of those representations into a common set of symbols. Language is tightly integrated with our brains, so much so that the right words can cause us to believe we've had an experience even when we actually haven't.
You don't believe me? Have you ever been brought to tears by a well-told story? Have you ever listened to a good storyteller and been able to smell the scents emanating from the spaces in the story? Language has immense power.
If you fill your mind with any particular set of symbols, you set in motion the entire power of your mind to process, analyze, and judge those symbols. That's what your brain is supposed to do. It keeps you alive by applying it's full power on critical circumstances. It increases the resources at your disposal by finding efficient ways to acquire the things you need. If you fill your mind with the symbols necessary to achieve wealth, you will find wealth; if you fill your mind with representations of peace, you will find peace.
The problem is that most of us spend most of the time filling our minds with garbage. Do you watch a lot of TV, read a lot of trashy books, or spend a lot of your time gossiping with friends? If so, you're programming your brain to focus on and analyze those things. Since thought is a limited resource, the time you spend focusing on junk is time you don't spend improving yourself or your circumstances.
A long time ago, we had a term for the value of computer output: GIGO (garbage in, garbage out). If you put bad data in a computer, you get bad data out. The mind is the same: if you fill your mind with meaningless drivel, you become an expert at meaningless drivel. That's fine, if that's what you want, but I believe that isn't what you want, is it?
Am I saying never read or watch fun media? Not at all... play is good. But limit it.
Pay attention to what you put in. Choose books, videos, and real-world experiences that expand your experience. Consume media that teaches you. It can be direct (text books) or indirect (stories and fictitious work), the choice is yours. But definitely pay attention to what you're putting in.
You wouldn't eat garbage, so why would you want to feed your mind garbage?