To take the word in a more restricted sense, the configuration of man alone is speaking, and it is itself so only in those of the phenomena that accompany and express the state of its moral sensibility.
I say it is only in this sort of phenomena; for, in all the others, man is in the same rank as the rest of sensible beings. By the permanent configuration of man, by his architectonic features, nature only expresses, just as in the animals and other organic beings, her own intention. It is true the intention of nature may go here much further, and the means she employs to reach her end may offer in their combination more of art and complication; but all that ought to be placed solely to the account of nature, and can confer no advantage on man himself.
In the animal, and in the plant, nature gives not only the destination; she acts herself and acts alone in the accomplishment of her ends. In man, nature limits herself in marking her views; she leaves to himself their accomplishment, it is this alone that makes of him a man.
Alone of all known beings—man, in his quality of person, has the privilege to break the chain of necessity by his will, and to determine in himself an entire series of fresh spontaneous phenomena. The act by which he thus determines himself is properly that which we call an action, and the things that result from this sort of action are what we exclusively name his acts. Thus man can only show his personality by his own acts.
The configuration of the animal not only expresses the idea of his destination, but also the relation of his present state with this destination. And as in the animal it is nature which determines and at the same time accomplishes its destiny, the configuration of the animal can never express anything else than the work of nature.
If then nature, whilst determining the destiny of man, abandons to the will of man himself the care to accomplish it, the relation of his present state with his destiny cannot be a work of nature, but ought to be the work of the person; it follows, that all in the configuration which expresses this relation will belong, not to nature, but to the person, that is to say, will be considered as a personal expression; if then, the architectonic part of his configuration tells us the views that nature proposed to herself in creating him, the mimic part of his face reveals what he has himself done for the accomplishment of these views.
It is not then enough for us, when there is question of the form of man, to find in it the expression of humanity in general, or even of that which nature has herself contributed to the individual in particular, in order to realize the human type in it; for he would have that in common with every kind of technical configuration. We expect something more of his face; we desire that it reveal to us at the same time, up to what point man himself, in his liberty, has contributed towards the aim of nature; in other words, we desire that his face bear witness to his character. In the first case we see that nature proposed to create in him a man; but it is in the second case only that we can judge if he has become so in reality.
Thus, the face of a man is truly his own only inasmuch as his face is mimic; but also all that is mimic in his face is entirely his own. For, if we suppose the case in which the greatest part, and even the totality, of these mimic features express nothing more than animal sensations or instincts, and, in consequence, would show nothing more than the animal in him, it would still remain that it was in his destiny and in his power to limit, by his liberty, his sensuous nature. The presence of these kinds of traits clearly witness that he has not made use of this faculty. We see by that he has not accomplished his destiny, and in this sense his face is speaking; it is still a moral expression, the same as the non-accomplishment of an act commanded by duty is likewise a sort of action.
We must distinguish from these speaking features which are always an expression of the soul, the features non-speaking or dumb, which are exclusively the work of plastic nature, and which it impresses on the human face when it acts independently of all influence of the soul. I call them dumb, because, like incomprehensible figures put there by nature, they are silent upon the character. They mark only distinctive properties attributed by nature to all the kind; and if at times they are sufficient to distinguish the individual, they at least never express anything of the person.
These features are by no means devoid of signification for the physiognomies, because the physiognomies not only studies that which man has made of his being, but also that which nature has done for him and against him.