“Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish in the sea and the birds in the sky and over every living creature that moves on the ground."
That's right, our original work assignment was to be put in charge of the creatures of the earth. We were their caretakers, just as God was ours. This assignment was not meant to be burdensome, but was meant to teach us to use our power to serve just as God uses His power to serve those who cannot serve themselves.
That's what work makes us do - serve others. When we do our work well, we see the benefits of our service not only in the form of a paycheck, but quite often in the increase in trust that we're given by our supervisors, by the esteem we are given from those we have helped, and our own sense of self-worth and dignity is affirmed.
Work also keeps us busy, and that can help us stay out of trouble. After all, it was during leisure time in the Garden of Eden that Adam and Eve got into trouble.
According to the Catechism of the Catholic Church: