Consequently art and literature, which express the different states of society, must share in some degree in this progressive march. But there are two things in literary work: on the one hand the ideas and social manners which it expresses, on the other the intelligence, the feeling, the imagination of the writer who becomes its interpreter. While the former of these elements tends incessantly to a greater perfection, the latter is subject to all the hazards of individual genius. Accordingly the progressive literature is only in the inspiration, and so to speak in the matter; it may and must therefore not be continuous in form. But more than this: in very advanced societies the very grandeur of ideas, the abundance of models, the satiety of the public render the task of the artist more and more difficult. The artist himself has no longer the enthusiasm of the first ages, the youth of imagination and of the heart; he is an old man whose riches have increased, but who enjoys his wealth less. If all the epochs of literature are considered as a whole it will be seen that they succeed each other in a constant order. After the period when the idea and the form combined in a harmonious manner comes another where the social idea is superabundant, and destroys the literary form of the preceding epoch. The middle ages introduced spiritualism in art; before this new idea the smiling untruths of Greek poetry fled away frightened. The classical form so beautiful, so pure, cannot contain high Catholic thought. A new art is formed; on this side the Alps it does not reach the maturity that produces masterpieces. But at that time all Europe was one fatherland; Italy completes what is lacking in France and elsewhere. The renaissance introduces new ideas into civilization; it resuscitates the traditions of antique science and seeks to unite them to the truths of Christianity. The art of the middle ages, as a vessel of too limited capacity, is broken by the new flood poured into it. These different ideas are stirred up and in conflict in the sixteenth century; they became co-ordinate and attain to an admirable expression in the following age. In the eighteenth century there is a new invasion of ideas; all is examined and questioned; religion, government, society, all becomes a matter of discussion for the school called philosophical. Poetry appeared dying out, history drying up, till a truer spirit was breathed into the literary atmosphere by the criticism of Lessing, the philosophy of Kant, and the poetry of Klopstock. It was at this transition period that Schiller appeared, retaining throughout his literary career much of the revolutionary and convulsive spirit of his early days, and faithfully reflecting much of the dominant German philosophy of his time.