"Don't despair, not even over the fact that you don't despair"

In this quote, Kafka is encouraging the reader to not give in to misery, even if they may feel like they have reason to. He is advising us that despair is not a required or inevitable emotion, and that we have the power to pick how we respond to tight spots. The expression "not even over the reality that you don't anguish" suggests that even if we are not feeling misery, we must not worry or feel guilty about it. Instead, we ought to accept our ability to stay hopeful and durable in the face of challenges. Overall, Kafka is urging us to have faith in ourselves and our capability to get rid of despair.