Thinking and acting, the two conflicting behaviors

Thinking and acting ad two different activities. It is almost as if these two undertakings were the fruits of the same thinking organ.
Let's imagine that this sophisticated organ had a switch, that could either be pushed to the right, or to the left, depending on the given task.
We flick the switch to the right, and it starts its logical decision-making apparatus. We move it to the left, and it sends a signal to our muscles to start moving ad take action, while it turns off the reasoning side of the machine.

Most of us try to keep the switch in the middle. We make a decision and start debating its validity, while we are acting on it.
It is as if we were in a casino, playing roulette. We pick our number, and instead of relaxing and watching the ball race around the wheel, we fret, fume and agonize over the results.
Engaging in such conflicting activities creates friction and stress. It stalls our progress and undermine our efforts.
When our brain is thinking, when we are in the "action" phase, our thoughts become a hindrance. Our brain activity during during that  could be compared to a useless, incontrollable tremor or twitch, that wastes energy without having a real purpose.
No one gets anywhere, while travelling in a car with the brakes engaged. The engine gets wrecked, and the vehicle gets significantly slowed down.