In (IV), I was simply noting that we live in a society where money is earned, for the most part at least. That is why we have work and jobs. In order to attain money, we must commit a portion of our time, and for many people, a majority of our lives.

For many hours a day, we slave our lives away to make money. However, time spent working is time lost somewhere else, like forming stronger relationships or enjoying a hobby. This is where the saying is relevant, especially for workaholics. It doesn't matter how much money you have if you don't have time to spend it or anyone to spend it on.