It is the interest of the imagination to change objects according to its caprice; the interest of the understanding is to unite its representations with strict logical necessity.

To satisfy the imagination, a discourse must have a material part, a body; and these are formed by the perceptions, from which the understanding separates distinct features or conceptions. For though we may attempt to obtain the highest pitch of abstraction, something sensuous always lies at the ground of the thought. But imagination strives to pass unfettered and lawless from one conception to another conception, and seeks not to be bound by any other connection than that of time. So when the perceptions that constitute the bodily part of a discourse have no concatenation as things, when they appear rather to stand apart as independent limbs and separate unities, when they betray the utter disorder of a sportive imagination, obedient to itself alone, then the clothing has æsthetic freedom and the wants of the fancy are satisfied. A mode of presentation such as this might be styled an organic product, in which not only the whole lives, but also each part has its individual life. A merely scientific presentation is a mechanical work, when the parts, lifeless in themselves, impart by their connection an artificial life to the whole.

On the other hand, a discourse, in order to satisfy the understanding and to produce knowledge, must have a spiritual part, it must have significance, and it receives this through the conceptions, by means of which those perceptions are referred to one another and united into a whole. The problem of satisfying the understanding by conformity with law, while the imagination is flattered by being set free from restrictions, is solved thus: by obtaining the closest connection between the conceptions forming the spiritual part of the discourse, while the perceptions, corresponding to them and forming the sensuous part of the discourse, appear to cohere merely through an arbitrary play of the fancy.

If an inquiry be instituted into the magic influence of a beautiful diction, it will always be found that it consists in this happy relation between external freedom and internal necessity. The principal features that contribute to this freedom of the imagination are the individualizing of objects and the figurative or inexact expression of a thing; the former employed to give force to its sensuousness, the latter to produce it where it does not exist. When we express a species or kind by an individual, and portray a conception in a single case, we remove from fancy the chains which the understanding has placed upon her and give her the power to act as a creator. Always grasping at completely determinate images, the imagination obtains and exercises the right to complete according to her wish the image afforded to her, to animate it, to fashion it, to follow it in all the associations and transformations of which it is capable. She may forget for a moment her subordinate position, and act as an independent power, only self-directing, because the strictness of the inner concatenation has sufficiently guarded against her breaking loose from the control of the understanding. An inexact or figurative expression adds to the liberty, by associating ideas which in their nature differ essentially from one another, but which unite in subordination to the higher idea. The imagination adheres to the concrete object, the understanding to this higher idea, and thus the former finds movement and variety even where the other verifies a most perfect continuity. The conceptions are developed according to the law of necessity, but they pass before the imagination according to the law of liberty.

Thought remains the same; the medium that represents it is the only thing that changes. It is thus that an eloquent writer knows how to extract the most splendid order from the very centre of anarchy, and that he succeeds in erecting a solid structure on a constantly moving ground, on the very torrent of imagination.

If we compare together scientific statement or address, popular address, and fine language, it is seen directly that all three express the idea with an equal faithfulness as regards the matter, and consequently that all three help us to acquire knowledge, but that as regards the mode and degree of this knowledge a very marked difference exists between them. The writer who uses the language of the beautiful rather represents the matter of which he treats as possible and desirable than indulges in attempts to convince us of its reality, and still less of its necessity. His thought does in fact only present itself as an arbitrary creation of the imagination, which is never qualified, in itself, to guarantee the reality of what it represents. No doubt the popular writer leads us to believe that the matter really is as he describes it, but does not require anything more firm; for, though he may make the truth of a proposition credible to our feelings, he does not make it absolutely certain. Now, feeling may always teach us what is, but not what must be. The philosophical writer raises this belief to a conviction, for he proves by undeniable reasons that the matter is necessarily so.

Starting from the principle that we have just established, it will not be difficult to assign its proper part and sphere to each of the three forms of diction. Generally it may be laid down as a rule that preference ought to be given to the scientific style whenever the chief consideration is not only the result, but also the proofs. But when the result merely is of the most essential importance the advantage must be given to popular elocution and fine language. But it may be asked in what cases ought popular elocution to rise to a fine, a noble style? This depends on the degree of interest in the reader, or which you wish to excite in his mind.

The purely scientific statement may incline either to popular discourse or to philosophic language, and according to this bias it places us more or less in possession of some branch of knowledge. All that popular elocution does is to lend us this knowledge for a momentary pleasure or enjoyment. The first, if I may be allowed the comparison, gives us a tree with its roots, though with the condition that we wait patiently for it to blossom and bear fruit. The other, or fine diction, is satisfied with gathering its flowers and fruits, but the tree that bore them does not become our property, and when once the flowers are faded and the fruit is consumed our riches depart. It would therefore be equally unreasonable to give only the flower and fruit to a man who wishes the whole tree to be transplanted into his garden, and to offer the whole tree with its fruit in the germ to a man who only looks for the ripe fruit. The application of the comparison is self-evident, and I now only remark that a fine ornate style is as little suited to the professor’s chair as the scholastic style to a drawing-room, the pulpit, or the bar.

The student accumulates in view of an ulterior end and for a future use; accordingly the professor ought to endeavor to transmit the full and entire property of the knowledge that he communicates to him. Now, nothing belongs to us as our own but what has been communicated to the understanding. The orator, on the other hand, has in view an immediate end, and his voice must correspond with an immediate want of the public. His interest is to make his knowledge practically available as soon as possible; and the surest way is to hand it over to the senses, and to prepare it for the use of sensation. The professor, who only admits hearers on certain conditions, and who is entitled to suppose in his hearers the dispositions of mind in which a man ought to be to receive the truth, has only in view in his lecture the object of which he is treating; while the orator, who cannot make any conditions with his audience, and who needs above everything sympathy, to secure it on his side, must regulate his action and treatment according to the subjects on which he turns his discourse. The hearers of the professor have already attended his lectures, and will attend them again; they only want fragments that will form a whole after having been linked to the preceding lectures. The audience of the orator is continually renewed; it comes unprepared, and perhaps will not return; accordingly in every address the orator must finish what he wishes to do; each of his harangues must form a whole and contain expressly and entirely his conclusion.

It is not therefore surprising that a dogmatic composition or address, however solid, should not have any success either in conversation or in the pulpit, nor that a fine diction, whatever wit it may contain, should not bear fruit in a professor’s chair. It is not surprising that the fashionable world should not read writings that stand out in relief in the scientific world, and that the scholar and the man of science are ignorant of works belonging to the school of worldly people that are devoured greedily by all lovers of the beautiful. Each of these works may be entitled to admiration in the circle to which it belongs; and more than this, both, fundamentally, may be quite of equal value; but it would be requiring an impossibility to expect that the work which demands all the application of the thinker should at the same time offer an easy recreation to the man who is only a fine wit.