What does the phrase “inward eye” mean?

Reading Comprehension: Read the quoted parts carefully and answer the questions in English. Write your answer in the corresponding space on the answer sheet.“For oft, when on my couch I lie
In vacant or in pensive mood,
They flash upon that inward eye”
What does the phrase “inward eye” mean?
【正确答案】:

HUMAN SOUL


【题目解析】:引文中的“inward eye”指的是人的灵魂,心灵。