There's a book I would recommend that's along the lines of everything you're saying here, called the Ruthless Elimination of Hurry. It's written by a pastor, but not necessarily to christian audiences. It even has some super interesting historical tidbits about how the industrial military complex + Keynesian economics really shifted the culture to a constant hustle to satisfy "wants" and spend what we don't have, rather than be content with our needs and save anything extra.