These ideas must present themselves to the eye in the portraiture of the affections, or be awakened by this portraiture in order that the pathetic may exist. But it is impossible to represent ideas, in the proper sense of the word, and positively, as nothing corresponds to pure ideas in the world of sense. But they can be always represented negatively and in an indirect way if the sensuous phenomenon by which they are manifested has some character of which you would seek in vain the conditions in _physical nature_. All phenomena of which the ultimate principle cannot be derived from the world of sense are an indirect representation of the upper-sensuous element. And how does one succeed in representing something that is above nature without having recourse to supernatural means? What can this phenomenon be which is accomplished by natural forces—otherwise it would not be a phenomenon—and yet which cannot be derived from physical causes without a contradiction? This is the problem; how can the artist solve it? It must be remembered that the phenomena observable in a man in a state of passion are of two kinds. They are either phenomena connected simply with animal nature, and which, therefore, only obey the physical law, without the will being able to master them, or the independent force in him being able to exercise an immediate influence over them. It is the instinct which immediately produces these phenomena, and they obey blindly the laws of instinct. To this kind belong, for example, the organs of the circulation of the blood, of respiration, and all the surface of the skin. But, moreover, the other organs, and those subject to the will, do not always await the decision of the will; and often instinct itself sets them immediately, in play, especially when the physical state is threatened with pain or with danger. Thus, the movements of my arm depend, it is true, on my will; but if I place my hand, without knowing it, on a burning body, the movement by which I draw it back is certainly not a voluntary act, but a purely instinctive phenomenon. Nay more, speech is assuredly subject to the empire of the will, and yet instinct can also dispose of this organ according to its whim, and even of this and of the mind, without consulting beforehand the will, directly a sharp pain, or even an energetic affection, takes us by surprise. Take the most impassible stoic and make him see suddenly something very wonderful, or a terrible and unexpected object. Fancy him, for example, present when a man slips and falls to the bottom of an abyss. A shout, a resounding cry, and not only inarticulate, but a distinct word will escape his lips, and nature will have acted in him before the will: a certain proof that there are in man phenomena which cannot be referred to his person as an intelligence, but only to his instinct as a natural force.