Thus it is now free arbitration which rules the beautiful. If nature has furnished the architectonic beauty, the soul in its turn determines the beauty of the play, and now also we know what we must understand by charm and grace. Grace is the beauty of the form under the influence of free will; it is the beauty of this kind of phenomena that the person himself determines. The architectonic beauty does honor to the author of nature; grace does honor to him who possesses it. That is a gift, this is a personal merit.
Grace can be found only in movement, for a modification which takes place in the soul can only be manifested in the sensuous world as movement. But this does not prevent features fixed and in repose also from possessing grace. There immobility is, in its origin, movement which, from being frequently repeated, at length becomes habitual, leaving durable traces.
But all the movements of man are not capable of grace. Grace is never otherwise than beauty of form animated into movement by free will; and the movements which belong only to physical nature could not merit the name. It is true that an intellectual man, if he be keen, ends by rendering himself master of almost all the movements of the body; but when the chain which links a fine lineament to a moral sentiment lengthens much, this lineament becomes the property of the structure, and can no longer be counted as a grace. It happens, ultimately, that the mind moulds the body, and that the structure is forced to modify itself according to the play that the soul imprints upon the organs, so entirely, that grace finally is transformed—and the examples are not rare—into architectonic beauty. As at one time an antagonistic mind which is ill at ease with itself alters and destroys the most perfect beauty of structure, until at last it becomes impossible to recognize this magnificent chef-d'oeuvre of nature in the state to which it is reduced under the unworthy hands of free will, so at other times the serenity and perfect harmony of the soul come to the aid of the hampered technique, unloose nature and develop with divine splendor the beauty of form, enveloped until then, and oppressed.
The plastic nature of man has in it an infinity of resources to retrieve the negligencies and repair the faults that she may have committed. To this end it is sufficient that the mind, the moral agent, sustain it, or even withhold from troubling it in the labor of rebuilding.
Since the movements become fixed (gestures pass to a state of lineament), are themselves capable of grace, it would perhaps appear to be rational to comprehend equally under this idea of beauty some apparent or imitative movements (the flamboyant lines for example, undulations). It is this which Mendelssohn upholds. But then the idea of grace would be confounded with the ideal of beauty in general, for all beauty is definitively but a property of true or apparent movement (objective or subjective), as I hope to demonstrate in an analysis of beauty. With regard to grace, the only movements which can offer any are those which respond at the same time to a sentiment.
The person (it is known what I mean by the expression) prescribes the movements of the body, either through the will, when he desires to realize in the world of sense an effect of which he has proposed the idea, and in that case the movements are said to be voluntary or intentional; or, on the other hand, they take place without its will taking any part in it—in virtue of a fatal law of the organism—but on the occasion of a sentiment, in the latter case, I say that the movements are sympathetic. The sympathetic movement, though it may be involuntary and provoked by a sentiment, ought not to be confounded with those purely instinctive movements that proceed from physical sensibility. Physical instinct is not a free agent, and that which it executes is not an act of the person; I understand then here exclusively, by sympathetic movements, those which accompany a sentiment, a disposition of the moral order.
The question that now presents itself is this: Of these two kinds of movement, having their principle in the person, which is capable of grace?
That which we are rigorously forced to distinguish in philosophic analysis is not always separated also in the real. Thus it is rare that we meet intentional movements without sympathetic movements, because the will determines the intentional movements only after being decided itself by the moral sentiments which are the principle of the sympathetic movements. When a person speaks, we see his looks, his lineaments, his hands, often the whole person all together speaks to us; and it is not rare that this mimic part of the discourse is the most eloquent. Still more there are cases where an intentional movement can be considered at the same time as sympathetic; and it is that which happens when something involuntary mingles with the voluntary act which determines this movement.
I will explain: the mode, the manner in which a voluntary movement is executed, is not a thing so exactly determined by the intention which is proposed by it that it cannot be executed in several different ways. Well, then, that which the will or intention leaves undetermined can be sympathetically determined by the state of moral sensibility in which the person is found to be, and consequently can express this state. When I extend the arm to seize an object, I execute, in truth, an intention, and the movement I make is determined in general by the end that I have in view; but in what way does my arm approach the object? how far do the other parts of my body follow this impulsion? What will be the degree of slowness or of the rapidity of the movement? What amount of force shall I employ? This is a calculation of which my will, at the instant, takes no account, and in consequence there is a something left to the discretion of nature.
But nevertheless, though that part of the movement is not determined by the intention itself, it must be decided at length in one way or the other, and the reason is that the manner in which my moral sensibility is affected can have here decisive influence: it is this which will give the tone, and which thus determines the mode and the manner of the movement. Therefore this influence, which exercises upon the voluntary movement the state of moral sensibility in which the subject is found, represents precisely the involuntary part of this movement, and it is there then that we must seek for grace.