From my article ‘Hollowing Out the Habits of Attention Part 4‘:
Thankfully God has given you a tool for controlling your brain and fasting from toxic thinking. That tool is called the prefrontal cortex. This is the part of the brain that enables you to observe your own thinking. You don’t have to be a brain scientist to use your prefrontal cortex. Every time you watch your own thinking, every time you choose to switch from one thought to another, that’s the prefrontal cortex working.
If you spend long enough using this part of your brain in the right way, you can learn to be alert, in a constant state of watchfulness to weed out toxic thinking. As thoughts arise in your brain, you can use your prefrontal cortex to watch what is happening and exercise second-by-second censorship. Often the process of simply observing your thinking is itself enough to extinguish the unwanted thought. As Hieromonk Damascene observed in Christ The Eternal Tao, “A thought cannot exist for long under the light of direct, objective observation. …just watch the thoughts disappear under the light of observation, as if we were an objective, disinterested spectator; they will pass one by one.” If you do this long enough, gradually you will come to realize that you are not your thoughts. You will begin to see your thoughts as things outside yourself, like airplanes in the sky, that you can either allow to land in the run-way of your mind, or reject and watch them fly away.