_Are our wills free, or are our actions predetermined?_ Some may object to this way of stating the question. Much confusion exists as to the meaning of the problem. A different way of stating it would lead to different treatment. What is the “will”? What do we mean by “free”? What do we mean by “predetermined”? _The problem of existence._ How did the universe come into being? This is the last problem in which interest can be stimulated from without. No matter in how many different ways he phrases it, a writer cannot convey this sense of mystery to another. It must arise from within. Most of the time we accept, we take for granted, the universe and the existent order of things, and it requires the greatest effort to keep alive our mystification and doubt for even short periods. * * * * * The list of questions foregoing is of course merely suggestive. It is impossible to select, say twenty-five questions, and pronounce them the twenty-five most important that can be asked. I fully realize there are questions of greater importance than some I have propounded. But I have not gone so far as to advise that every one of these should be thought over. The list has been given merely for thought stimulation, and to indicate what is meant by “worth while” questions. Unfortunately I have not been able to explain why most of these are so important. To have done so would have required too much time for each individual problem. It would have drawn us too far out of our subject. The reader must find out or sense the importance for himself. Practically all of the problems given in the list come under one of the sciences, especially if we count metaphysics or philosophy as a science, which it is in so far as it is organized knowledge. This may seem somewhat narrow. Now I admit there are important problems which are not included in any science. But there are very few. As soon as deep thought is given to a problem its treatment becomes systematic. It either falls into one of the sciences or a new science evolves about it. John Stuart Mill once started a journal in which he promised himself to put one thought a day, but he did not permit himself to record there any thought on a problem falling within one of the special sciences. None of the thoughts he put in the journal is of any great value. It came to an abrupt end in about two months.