Viktor Frankl, 1946
This book was recommended by a good friend of mine -- and it must have been good, as he told me.
"Don't read it in a day, it's some heavy shit".
Overall, I agree: it's incredibly humbling to peer into one's life and perspective in a position of seemingly total vulnerability and hopelessness, and realize that
"Everything can be taken from a man but one thing: the last of the human freedoms—to choose one’s attitude in any given set of circumstances, to choose one’s own way."