This is water. - David Foster Wallace

The reality is that dying isn’t bad, but it takes forever. And that forever is no time at all. I know that sounds like a contradiction, or maybe just wordplay. What it really is, it turns out, is a matter of perspective. — David Foster Wallace “Good Old Neon” (2004)

Everybody is identical in their secret unspoken belief that way deep down they are different from everyone else.

"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.