Thank you very much. I left out a last sentence on the same theme.
1) The portrait stands for the dark side of his personality, which he tries to forget by locking it in a room. The moral of the novel is that every excess must be punished and reality cannot be escaped.
2) When Dorian destroys the picture, he cannot avoid the punishment for all his sins, that is, death.
3) The corrupting picture could be seen as a symbol of the immorality and bad conscience of the Victorian middle class.
4) Dorian and his pure, innocent appearance are symbols of bourgeois hypocrisy.
5) Finally, the picture, restored to its original beauty, illustrated Wilde’s theory concerning (ON, ABOUT) the eternity of art.
1 - 4 -- OK
5. delete "concerning" and replace with "about"
6) The last sentence that you left out is an important addition to the theme. It highlights the idea that the restored picture represents Wilde's theory about the eternal nature of art.
To explain how to get this answer, one can analyze the context of the sentence and the previous statements. In the previous sentences, the discussion is about the symbolism of the portrait and its connection to Dorian's dark side and the consequences of his actions.
To find the answer to the question, one can consider the overall theme and message of the novel. By understanding the themes of excess, punishment, and the inability to escape reality, we can infer that the novel might also touch upon the concept of art and its endurance.
Looking at the sentence itself, it mentions that the restored picture illustrates Wilde's theory. This suggests that the portrayal of the restored picture in its original beauty is connected to an idea or theory. Considering the context of the previous sentences, where the portrait is discussed as a symbol, it becomes evident that the restored picture represents Wilde's theory concerning the eternity of art.
Therefore, one can conclude that the answer to the question is that the sentence is illustrating Wilde's theory about the eternity of art.