The best investment I've made has been quitting a well-paid, big company job to work for an early Rails software startup. I worked many more hours and was paid

The best investment I've made has been quitting a well-paid, big company job to work for an early Rails software startup. I worked many more hours and was paid less money (the investment). I had an amazing time, learned very valuable skills, and am in a much better place in my career because of it. This will continue paying dividends in salary and enjoying my work for the rest of my life.