But if we leave these speculations in regard to the future aside for the moment, and confine ourselves to religions such as they are at present or have been in the past, it becomes clearly evident that these individual cults are not distinct and autonomous religious systems, but merely aspects of the common religion of the whole Church, of which the individuals are members. The patron saint of the Christian is chosen from the official list of saints recognized by the Catholic Church; there are even canonical rules prescribing how each Catholic should perform this private cult. In the same way, the idea that each man necessarily has a protecting genius is found, under different forms, at the basis of a great number of American religions, as well as of the Roman religion (to cite only these two examples); for, as will be seen later, it is very closely connected with the idea of the soul, and this idea of the soul is not one of those which can be left entirely to individual choice. In a word, it is the Church of which he is a member which teaches the individual what these personal gods are, what their function is, how he should enter into relations with them and how he should honour them. When a methodical analysis is made of the doctrines of any Church whatsoever, sooner or later we come upon those concerning private cults. So these are not two religions of different types, and turned in opposite directions; both are made up of the same ideas and the same principles, here applied to circumstances which are of interest to the group as a whole, there to the life of the individual. This solidarity is even so close that among certain peoples,[90] the ceremonies by which the faithful first enter into communication with their protecting geniuses are mixed with rites whose public character is incontestable, namely the rites of initiation.[91] There still remain those contemporary aspirations towards a religion which would consist entirely in internal and subjective states, and which would be constructed freely by each of us. But howsoever real these aspirations may be, they cannot affect our definition, for this is to be applied only to facts already realized, and not to uncertain possibilities. One can define religions such as they are, or such as they have been, but not such as they more or less vaguely tend to become. It is possible that this religious individualism is destined to be realized in facts; but before we can say just how far this may be the case, we must first know what religion is, of what elements it is made up, from what causes it results, and what function it fulfils--all questions whose solution cannot be foreseen before the threshold of our study has been passed. It is only at the close of this study that we can attempt to anticipate the future.