This person struggles to achieve truth in her work. This person doesn't suggest that the truth necessarily has to relate to the world or to life, but it must be the work's own truth, the destination of the line of words as defined by the journey to get there.
Other Writers and Artists
The references to these people offers not only hope, but the suggestion that there is no one way to follow the line. In other words, the ways to follow the line are as numerous as the infinite number of lines themselves.
The relative lack of frequency of references to these people suggests that they are not the book's primary focus, and also that the author is suggesting that these people should not be the primary focus of any writer's work.
The metaphoric value of the reference to this person...
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