This is very good advice. I enjoyed this essay — seems related to the realization many people have had about work and passion as well. The same authors selling purpose also sell the idea that unless you leap from bed each morning passionate about the work to be done, then some fundamental part of your life is amiss.
Sometimes work is just work — a place you go, do the best job you can, and make a little money so you can pay bills and pursue your passions or interests with the rest of your life. The longer my professional life goes on, the more I seek passion and fulfillment in my personal life instead.