I just started reading How Will You Measure Your Life? by Clayton M. Christensen. So far, it's great. The quote below¹ is an example of the approach the book takes, taking a quantitative, evidence-based look at how we should choose our path in life.

Herzberg notes the common assumption that job satisfaction is one big continuous spectrum—starting with very happy on one end and reaching all the way down to absolutely miserable on the other—is not actually the way the mind works. Instead, satisfaction and dissatisfaction are separate, independent measures. This means, for example, that it's possible to love your job and hate it at the same time.