What is the author's purpose in writing, Autumn?

The book begins with a letter to the unborn child written at the end of August, as summer ends and autumn begins. In it, the author describes the family and the world that the child will be born into, and also reveals his purposes in writing the book – to comment and consider the world as it is in order to give the child some understanding of that world, the author’s insights into it, and how the child might come to see it.