What this book offers is a system of thought and of points of view as to conduct, as these have jointly grown out of personal experience. It will be useful to introduce them with an autobiographical statement. The ideas which follow are such as have been found by me, the author, to be fruitful. Certainly I claim for them objectivity; but I do so because of what I have found them to mean in my own life. He who has been scorched by lightning knows that...