Synthesized answer
The provided passages do not contain information about what questions remain unanswered in Arthur Schopenhauer's "Essay on the Freedom of the Will" [1]. The passages describe the essay as a "brilliant and elegant" treatment of free will and determinism that remains relevant to modern readers [1]. They also state that it is a useful introduction for students of philosophy or religion [1].
Therefore, it is not possible to answer what questions remain unanswered based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Essay on the Freedom of the Will by Arthur Schopenhauer Description: DIVBrilliant and elegant in its treatment, Schopenhauer's 1839 essay on free will and determinism still remains relevant to modern readers. A useful introduction to the philosopher's work for students of philosophy or religion. /div Categories: Philosophy Pages: 130 Snippet: DIVBrilliant and elegant in its treatment, Schopenhauer's 1839 essay on free will and determinism still remains relevant to modern readers. A useful introduction to the philosopher's work for students of philosophy or religion. /div