Freedom of Simplicity: Finding Harmony in a Complex World by Richard J. Foster, originally published in 1981; now available in several formats through Amazon, Google Books, and Barnes & Noble, to name the biggies. Foster is or has been a theologian, teacher, pastor and writer, and (I just found out) lives near Denver.
We’ve had the 1989 paperback version of this book on our shelves for many years; I think Jim brought it into the marriage. For some reason I just recently decided to read it and have been challenged and rebuked by many of its ideas. Foster is well known for an earlier book, Celebration of Discipline, with this book being somewhat of a followup.