The Great Escape

It is possible to be unhappy or worried, or to feel stress, even at times when you think your life is generally going well. Indeed, sadness, pain, and stress might be inevitable during some of the experiences one must go through in order to build a good life. Army boot camp, graduate studies in economics, medical school, or dealing with the death of a parent are examples of unpleasant experiences that are nevertheless an essential part of life. 

The above is from Angus Deaton's The Great Escape, page 52. I agree with Nils' review of the book here.

Addendum: Shout out to my girlfriend who allowed me to steal her copy of this book. (In my defense, it's not really likely that she'll ever get around to finish it anyway.)