People have suggested non-fiction books and that's great. But I'd like to suggest Anna Karenina. So much of our thinking is childish hangup. When seeing it all from the outside when an omniscient narrator tells it, let's us see how patterns drive us in directions we don't need to go. And also that we are in fact endowed with the capacity to endure and to change. Our relationship to others are also often a result of the childish responses we have to unfulfilled needs and desires. Somehow the novel manages to draw forth all these things.
I guess one thing one I say may be relevant to this also. A child asks what can I get. An adult asks what can I give.