There is a lot of information in this book, but the basic thesis that a city is best designed with the twin principles of democracy and ecology is powerful.
It is not immediately applicable to architects (as opposed to urbanists and landscape architects) but the book is well worth pondering.
Form follows the flow of everyday life. Even the form of a radical future follows the flow of everyday life.
page 299
No landscape can be more beautiful than it is just.
page 95