You Are a Badass: How to Stop Doubting Your Greatness and Start Living an Awesome Life (Jen Sincero)
This is one of the few books that I've come across that lived up to its fanfare. I wanted to underline pretty much every sentence because so many of them packed a mean punch. Jen Sincero does not spend much time over-explaining or repeating the same messages ad nauseum, like a lot of self help books do in order to fill up space. The messages she does repeat throughout the book, however, are worth repeating.