The Little Prince by Atione de Saint Exupery

The dedication is just beautiful and should absolutely not be missed.

Adults-- I am feeling, increasingly, like this would be an amazing book to pair with The Catcher in the Rye 

I have lived a great deal among the grown-ups. I have seen them intimately, close at hand. And that hasn't much improved my opinion of them. p5

I would bring myself down to his level. I would talk to him about bridge, and golf, and politics, and neckties. And the grown-up would be greatly pleased to have met such a sensible man. p5

_________
On making the discovery, the astronomer had presented it to the International Astronomical Congress, in a great demonstration. But he was in Turkish costume, and so nobody would believe what he said.

Grown-ups are like that...
p15
_______________

Children should always show great forbearance toward grown-up people. p17

He did not know how the world is simplified for kings. To them, all men are subjects. p41

It is only with the heart that one can see rightly; what is essential is invisible to the eye. p87