Breaking the Frozen Sea

According to Franz Kafka, “a book must be the axe for the frozen sea inside us.” What you think this quotation means? Which short story or personal essay (“Lamb to the Slaughter,” "Born of Man and Woman," "The Lady or the Tiger," "The Utterly Perfect Murder," "Fish Eyes," "The Scarlet Ibis") has broken the most “frozen sea” inside of you? Please explain with one short passage from the story.