Of these two equally indispensable factors, the former is certainly not the less important, for this is the one which furnishes the original matter for the idea of the soul. Perhaps some will be surprised to see so considerable a rôle attributed to the impersonal element in the genesis of the idea of personality. But the philosophical analysis of the idea of person, which has gone far ahead of the sociological analysis, has reached analogous results on this point. Among all the philosophers, Leibniz is one of those who have felt most vividly what a personality is; for before all, the nomad is a personal and autonomous being. Yet, for Leibniz, the contents of all the monads is identical. In fact, all are consciousnesses which express one and the same object, the world; and as the world itself is only a system of representations, each particular consciousness is really only the reflection of the universal consciousness. However, each one expresses it from its own point of view, and in its own manner. We know how this difference of perspectives comes from the fact that the monads are situated differently in relation to each other and to the whole system which they constitute. Kant expresses the same sentiment, though in a different form. For him, the corner-stone of the personality is the will. Now the will is the faculty of acting in conformity with reason, and the reason is that which is most impersonal within us. For reason is not my reason; it is human reason in general. It is the power which the mind has of rising above the particular, the contingent and the individual, to think in universal forms. So from this point of view, we may say that what makes a man a personality is that by which he is confounded with other men, that which makes him a man, not a certain man. The senses, the body and, in a word, all that individualizes, is, on the contrary, considered as the antagonist of the personality by Kant. This is because individuation is not the essential characteristic of the personality. A person is not merely a single subject distinguished from all the others. It is especially a being to which is attributed a relative autonomy in relation to the environment with which it is most immediately in contact. It is represented as capable of moving itself, to a certain degree: this is what Leibniz expressed in an exaggerated way when he said that the monad was completely closed to the outside. Now our analysis permits us to see how this conception was formed and to what it corresponds.