I have a lot of the classics on my list, but a new one that I've found extremely growth spurring was "Ego is the Enemy" by Ryan Holiday. I never really considered myself an egotists; confident perhaps, but something I never struggled with. This book showed me that I indeed did have more ego than necessary and gave me some really good guidance on how to live a better, happier, and more fulfilled life. Really something for a book I didn't even know I needed.