"Te occidere possunt sed te edere non possunt nefas est." (Roughly, "They can kill you, but the legalities of eating you are quite a bit dicier.") - David Foster Wallace

They can kill you, but the legalities of eating you are quite a bit dicier.

The really important kind of freedom involves attention, and awareness, and discipline, and effort, and being able truly to care about other people and to sacrifice for them, over and over, in myriad petty little unsexy ways, every day.

If, by the virtue of charity or the circumstance of desperation, you ever chance to spend a little time around a Substance-recovery halfway facility like Enfield MA’s state-funded Ennet House, you will acquire many exotic new facts…

That certain persons simply will not like you no matter what you do.

That sleeping can be a form of emotional escape and can with sustained effort be abused. That purposeful sleep-deprivation can also be an abusable escape.

That you do not have to like a person in order to learn from him/her/it. That loneliness is not a function of solitude. That logical validity is not a guarantee of truth. That it takes effort to pay attention to any one stimulus for more than a few seconds. That boring activities become, perversely, much less boring if you concentrate intently on them. That if enough people in a silent room are drinking coffee it is possible to make out the sound of steam coming off the coffee. That sometimes human beings have to just sit in one place and, like, hurt. That you will become way less concerned with what other people think of you when you realize how seldom they do. That there is such a thing as raw, unalloyed, agendaless kindness.

That it is possible to fall asleep during an anxiety attack.

That concentrating intently on anything is very hard work.

That 99% of compulsive thinkers’ thinking is about themselves; that 99% of this self-directed thinking consists of imagining and then getting ready for things that are going to happen to them; and then, weirdly, that if they stop to think about it, that 100% of the things they spend 99% of their time and energy imagining and trying to prepare for all the contingencies and consequences of are never good. In short that 99% of the head’s thinking activity consists of trying to scare the everliving shit out of itself. That it is possible to make rather tasty poached eggs in a microwave oven. That some people’s moms never taught them to cover up or turn away when they sneeze.

"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.