Answer: textual evidence: "By the way, this difference between us remains much the same to this very day."
Explanation: "Letter to his Father" is the name usually given to a letter that Franz Kafka wrote to his father Hermann. The letter was 103 pages long and it was originally written in German. In the letter Kafka told his father how fearful he was of him and his abusive behavior, not only during his childhood but also in his adulthood.