How can even the idea of rebellion against corporate culture stay meaningful when Chrysler Inc. advertises trucks by invoking “The Dodge Rebellion”? … - David Foster Wallace

"Learning how to think" really means learning how to exercise some control over how and what you think.
It means being conscious and aware enough to choose what you pay attention to and to choose how you construct meaning from experience.
Because if you cannot or will not exercise this kind of choice in adult life, you will be totally hosed.

Even as I wrote my note to Fern, for instance, expressing sentiments and regrets that were real, a part of me was noticing what a fine and sincere note it was, and anticipating the effect on Fern of this or that heartfelt phrase, while yet another part was observing the whole scene of a man in a dress shirt and no tie sitting at his breakfast nook writing a heartfelt note on his last afternoon alive, the blondwood table's surface trembling with sunlight and the man's hand steady and face both haunted by regret and ennobled by resolve, this part of me sort of hovering above and just to the left of myself, evaluating the scene, and thinking what a fine and genuine-seeming performance in a drama it would make if only we all had not already been subject to countless scenes just like it in dramas ever since we first saw a movie or read a book, which somehow entailed that real scenes like the one of my suicide note were now compelling and genuine only to their participants, and to anyone else would come off as banal and even somewhat cheesy or maudlin, which is somewhat paradoxical when you consider – as I did, setting there at the breakfast nook – that the reason scenes like this will seem stale or manipulative to an audience is that we’ve already seen so many of them in dramas, and yet the reason we’ve seen so many of them in dramas is that the scenes really are dramatic and compelling and let people communicate very deep, complicated emotional realities that are almost impossible to articulate in any other way, and at the same time still another facet or part of me realizing that from this perspective my own basic problem was that at an early age I’d somehow chosen to cast my lot with my life’s drama’s supposed audience instead of with the drama itself, and that I even now was watching and gauging my supposed performance’s quality and probable effects, and thus was in the final analysis the very same manipulative fraud writing the note to Fern that I had been throughou

The man who knows his limitations, has none.