In Franz Kafka's diaries from 1910 to 1923, he reflects on the transformative effect his sisters have on his identity. He feels that when he is with them, he becomes a more fearless, powerful, and surprising individual. This contrast highlights how intimate relationships can significantly influence one's sense of self and emotional expression.

Kafka suggests that his sisters inspire feelings and capacities within him that are seldom accessed in the presence of others. The depth of connection he experiences with them allows him to express himself in ways that are typically reserved for his writing, underlining the importance of familial bonds in shaping one's inner life.