HKB
never have suggested the idea of an energy which communicates itself and which can even confound itself with others and, through these combinations and mixings, give rise to new effects.
Therefore, the idea of force, as implied in the conception of the causal relation, must present a double character. In the first place, it can come only from our internal experience; the only forces which we can directly learn about are necessarily moral forces. But, at the same time, they must be impersonal, for the notion of an impersonal power was the first to be constituted. Now the only ones which satisfy these two conditions are those coming from life together: they are collective forces. In fact, these are, on the one hand, entirely psychical; they are made up exclusively of objectified ideas and sentiments. But, on the other hand, they are impersonal by definition, for they are the product of a co-operation. Being the work of all, they are not the possession of anybody in particular. They are so slightly attached to the personalities of the subjects in whom they reside that they are never fixed there. Just as they enter them from without, they are also always ready to leave them. Of themselves, they tend to spread further and further and to invade ever new domains: we know that there are none more contagious, and consequently more communicable. Of course physical forces have the same property, but we cannot know this directly; we cannot even become acquainted with them as such, for they are outside us. When I throw myself against an obstacle, I have a sensation of hindrance and trouble; but the force causing this sensation is not in me, but in the obstacle, and is consequently outside the circle of my perception. We perceive its effects, but we cannot reach the cause itself. It is otherwise with social forces: they are a part of our internal life, as we know, more than the products of their action; we see them acting. The force isolating the sacred being and holding profane beings at a distance is not really in this being; it lives in the minds of the believers. So they perceive it at the very moment when it is acting upon their wills, to inhibit certain movements or command others. In a word, this constraining and necessitating action, which escapes us when coming from an external object, is readily perceptible here because everything is inside us. Of course we do not always interpret it in an adequate manner, but at least we cannot fail to be conscious of it.