"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.

"There come to the writer literally thousands of letters every year, asking him questions, some of them of the strangest. A man is dying of cancer, and do I think it can be cured by a fast? A man is unable to make his wife happy, and can I tell him what is the matter with women? A man has invested his savings in mining stock, and can I tell him what to do about it? A man works in a sweatshop, and has only a little time for self-improvement, and will I tell him what books he ought to read? Many such questions every day make one aware of a vast mass of people, earnest, hungry for happiness, and groping as if in a fog. The things they most need to know they are not taught in the schools, nor in the newspapers they read, nor in the church they attend. Of these agencies, the first is not entirely competent, the second is not entirely honest, and the third is not entirely up to date. Nor is there anywhere a book in which the effort has been made to give to everyday human beings the everyday information they need for the successful living of their lives.

"For the present book the following claims may be made. First, it is a modern book; its writer watches hour by hour the new achievements of the human mind, he reaches out for information about them, he seeks to adjust his own thoughts to them and to test them in his own living. Second, it is, or tries hard to be, a wise book; its writer is not among those too-ardent young radicals who leap to the conclusion that because many old things are stupid and tiresome, therefore everything that is old is to be spurned with contempt, and everything that proclaims itself new is to be taken at its own valuation. Third, it is an honest book; its writer will not pretend to know what he only guesses, and where it is necessary to guess, he will say so frankly. Finally, it is a kind book; it is not written for its author's glory, nor for his enrichment, but to tell you things that may be useful to you in the brief span of your life. It will attempt to tell you how to live, how to find health and happiness and success, how to work and how to play, how to eat and how to sleep, how to love and to marry and to care for your children, how to deal with your fellow men in business and politics and social life, how to act and how to think, what religion to believe, what art to enjoy, what books to read. A large order, as the boys phrase it!"