Please make the following in red clear for me.

How often are you 'preoccupied' in your thoughts? How many times, while driving home from work, have you caught yourself running a movie in your mind of some incident earlier in the day--- and upon arriving home you're unable to recall the journey?

"The chains of habit are too weak to be felt until they are too strong to be broken."...

In order to carry out this review activity you have to hand over the act of 'driving' to your autopilot so your conscious attention can be focused inward. It is no coincidence that we call this process 'reflection.'

In the above, does "review activity" refer to the state (or act) of being preoccupied in your thoughts? And I have trouble understanding why the author used the word "reflection" there. Is it because the "review activity" is an act of reflecting (that is, thinking, pondering, or meditating)? It seems there is some more in the word "reflection".

Thank you.