The external doesnt necessarily have to directly affect you to be influenced. Like a Full Moon. The Full Moon doesnt physically have to turn people into monsters, or somehow change how they act. People will look at the sky and say “Oh look, it’s a Full Moon tonight, let’s do something crazy!” People do it themselves. And police reports will tell you that crime and wayward behavior generally increase on a Full Moon. But regardless of any direct affects of the moon itself, people will change their own behavior, their own thoughts and actions, solely on the fact that the moon is full, and what that means to them.
Your brain is very much like a lump of clay, where you can actively mold it to be whatever you want. With time and effort, your brain will take the form of anything you can imagine. The brain of a hero, the brain of a writer, the brain of a president…anything you can imagine, you can become. The brain is your tool, your physical tool that creates these realities.
The brain has to work this way, otherwise humans could have never come as far as we have. We needed to adapt and transform ourselves into what was necessary to survive, succeed, and excel/surpass.
When you change your brain, your brain changes you. It changes how you think and how you act. These in turn change your life. To grasp full control, you must be aware of the status of your brain, how it is being shaped in this moment, and if this coincides with the results you wish to have.
Remember, your brain is modifiable like clay, not permanent like concrete. Every day the brain changes. You might as well learn to use it.