Which lines from "sympathy" best convey the idea that physical pain is part of the anguish of imprisonment?

Which statement from "letter to his father" is similar to gregor's inability tocommunicate with his father as a bug in the metamorphosis?

Unity in a paragraph means: my writing persuades my readers to agree with the argument i am presenting. the paragraph discusses and supports one thought throughout the entire paragraph. all sentences in a paragraph are the same length and structure. the first sentence and the last sentence echo the exact same thought.

What key advice did the old-timer give him?