Ask HN: What books should you read to improve your daily life?

As the title suggest, I used the word improve. I am of the belief that I am mentally stable and appreciate my life, but I'm always willing to learn and hear new perspectives that not only help myself, but those I interact with. I am also soon to be a fresh graduate of college, and have significant time until I begin my full time job, so I am very open to reading books that my undergraduate education couldn't put into a class.