The value is entirely in the part you would edit out.
Most self-reflection is quietly performed for an imaginary audience. A page written for nobody is where the truth turns up.
One side of paper, no editing, no rereading while you write. Burn it afterwards if that is what makes it honest.
You will learn more in twenty minutes than in a month of thinking about it in the car.
How to actually do it
01 One side of paper, by hand, in one sitting.
02 Do not reread until you have finished.
03 Keep it somewhere private or destroy it.
