In "Letters to Milena," Franz Kafka expresses the deep connection between his personal struggles with illness and his emotional attachment to Milena. He reflects on how both his health and his ailments intertwine with his thoughts of her. This reveals not just his vulnerability but also the impact their relationship has on his state of mind.

Kafka's contemplation emphasizes the duality of his experiences; both love and suffering are intrinsically linked. Through these letters, he conveys that his feelings for Milena are not separate from his physical and mental well-being, suggesting a profound interdependence between the two that shapes his entire existence.