Not only does the unconscious self preside over the functions of our organism, but also over _all our actions whatever they are_. It is this that we call imagination, and it is this which, contrary to accepted opinion, _always_ makes us act even, and _above all_, against _our will_ when there is antagonism between these two forces. WILL AND IMAGINATION If we open a dictionary and look up the word "will", we find this definition: "The faculty of freely determining certain acts". We accept this definition as true and unattackable, although nothing could be more false. This will that we claim so proudly, always _yields_ to the imagination. It is an _absolute_ rule that admits of no _exception_. "Blasphemy! Paradox!" you will exclaim. "Not at all! On the contrary, it is the purest truth," I shall reply. In order to convince yourself of it, open your eyes, look round you and try to understand what you see. You will then come to the conclusion that what I tell you is not an idle theory, offspring of a sick brain but the simple expression of a _fact_. Suppose that we place on the ground a plank 30 feet long by 1 foot wide. It is evident that everybody will be capable of going from one end to the other of this plank without stepping over the edge. But now change the conditions of the experiment, and imagine this plank placed at the height of the towers of a cathedral. Who then will be capable of advancing even a few feet along this narrow path? Could you hear me speak? Probably not. Before you had taken two steps you would begin to tremble, and _in spite of every effort of your will_ you would be certain to fall to the ground. Why is it then that you would not fall if the plank is on the ground, and why should you fall if it is raised to a height above the ground? Simply because in the first case you imagine that it is easy to go to the end of this plank, while in the second case you _imagine_ that you _cannot_ do so. Notice that your will is powerless to make you advance; if you _imagine_ that you _cannot_, it is _absolutely_ impossible for you to do so. If tilers and carpenters are able to accomplish this feat, it is because they think they can do it. Vertigo is entirely caused by the picture we make in our minds that we are going to fall. This picture transforms itself immediately into fact _in spite of all the efforts of our will_, and the more violent these efforts are, the quicker is the opposite to the desired result brought about. Let us now consider the case of a person suffering from insomnia. If he does not make any effort to sleep, he will lie quietly in bed. If on the contrary he tries to force himself to sleep by his _will_, the more efforts he makes, the more restless he becomes.