Thoughts are things. They exist on another (astral ?) plane. They have an incredible force by the phenomenon of resonance. When the vibration rate of your thoughts contacts thoughts with the same vibration rate, the resonance amplifies them and they tend to materialize. Think success and you will be successful. Think you are sick and you will be sick.
Resonance is a very powerful effect in our physical world. Eg a military unit crossed a bridge marching in miltary uniform steps, like militaries do. The bridge collapsed. The simple solution is to let every soldier march at will.
Everyone knows the power of lasers. This power is due to 1) resonace 2) focusing.
A bulb of 100 watts does not have so much power. A laser of 100 watts can cut thick slabs of steel.
Practical conclusions: a) think good thoughts 2) concentrate strongly upon them.