Thinking is mostly not something you actively do. Thoughts mostly occur to you. They well up from below. “You” are the culmination of prior events over which you have little or no control. To the extent that people deny and abhor this fact, they are especially vulnerable to censorship.
[Added July 29]
I am largely in agreement with Sam Harris on the topic of free will.
Sam is right, thoughts do randomly pop in your head. You might ask yourself what brought this thought on instead of instantly plunging right in. All though there are many things that trigger a thought; it’s possible it stemmed from the fine art of deception. Question thoughts for your own protection!