When i was about 12 I tried meditating, concentrating on seeing a dot of light, after reading a book by a Zen Roshi.
After you see the dot. you concentrate on making it expand until you are surrounded by it. I did it, but it only lasted an instant and I couldn't do it again.
You know those Master locks with the really long hasp or whatever the top part is called ( see pic if it loads) that can be cinched down to different spots? I used one for my bike lock. I went to get my bike, it wasn't locked but I had a thought, with absolute certainty, that if I slid the lock up and then back down quickly the lock would open. So I did it. then I did it again, then again slowly. then I thought there was something wrong with the lock. I could never get it to do it again.
Knowing with certainty, with not a speck of doubt, can make things happen.