Question

What was the painful thought that disturbed the writer ?

Answer 1

Hi thank you for asking the question
the most disturbed and painful thought that a writer had can be due to loss of something dear. like loss of someone dear and the memories of time spend with them can be painful because the writer can never have them back nor can he see the face of the dear one. or some memory that is really dear to the writer which he can never relive 
hope this answer is satisfying enough