In reality, then, there are no religions which are false. All are true in their own fashion; all answer, though in different ways, to the given conditions of human existence. It is undeniably possible to arrange them in a hierarchy. Some can be called superior to others, in the sense that they call into play higher mental functions, that they are richer in ideas and sentiments, that they contain more concepts with fewer sensations and images, and that their arrangement is wiser. But howsoever real this greater complexity and this higher ideality may be, they are not sufficient to place the corresponding religions in different classes. All are religions equally, just as all living beings are equally alive, from the most humble plastids up to man. So when we turn to primitive religions it is not with the idea of depreciating religion in general, for these religions are no less respectable than the others. They respond to the same needs, they play the same rôle, they depend upon the same causes; they can also well serve to show the nature of the religious life, and consequently to resolve the problem which we wish to study. But why give them a sort of prerogative? Why choose them in preference to all others as the subject of our study?--It is merely for reasons of method. In the first place, we cannot arrive at an understanding of the most recent religions except by following the manner in which they have been progressively composed in history. In fact, historical analysis is the only means of explanation which it is possible to apply to them. It alone enables us to resolve an institution into its constituent elements, for it shows them to us as they are born in time, one after another. On the other hand, by placing every one of them in the condition where it was born, it puts into our hands the only means we have of determining the causes which gave rise to it. Every time that we undertake to explain something human, taken at a given moment in history--be it a religious belief, a moral precept, a legal principle, an æsthetic style or an economic system--it is necessary to commence by going back to its most primitive and simple form, to try to account for the characteristics by which it was marked at that time, and then to show how it developed and became complicated little by little, and how it became that which it is at the moment in question. One readily understands the importance which the determination of the point of departure has for this series of progressive explanations, for all the others are attached to it. It was one of Descartes's principles that the first ring has a predominating place in the chain of scientific truths. But there is no question of placing at the foundation of the science of religions an idea elaborated after the cartesian manner, that is to say, a logical concept, a pure possibility, constructed simply by force of thought. What we must find is a concrete reality, and