The Book of Life by Upton Sinclair

The writer of this book has been in this world some forty-two years. That may not seem long to some, but it is long enough to have made many painful mistakes, and to have learned much from them. Looking about him, he sees others making these same mistakes, suffering for lack of that same knowledge which he has so painfully acquired. This being the case, it seems a friendly act to offer his knowledge, minus the blunders and the pain.