In 1918, Chesterton wrote a series of articles called “The Superstition of Divorce” for the New Witness. The essays were published as a collection under the same title in 1920. He said it wasn’t supposed to be a book, but a pamphlet, and the object of a pamphlet is to be out of date as soon as possible. “It can only survive when it does not succeed.”
In this book, Chesterton for the most part does not talk about the sacramental and religious nature of marriage, but rather focuses on the practical and historical and social reasons for it. His main point is that if the family breaks apart, the whole society will break apart.
source: http://www.chesterton.org/lecture-33/