The Crossroads of Should and Must is a must-have book for everyone. This sounds trite but whenever I am feeling at all lost or stressed, I will pick it up and thumb through it. It’s a great reminder of the things in life that are actually important. The things you should do, vs. the things you must do. It always gets me back on track and has really helped me a lot in life in terms of finding meaning in my life and work… and making those tougher calls.