In "The Discovery of Slowness" by Sten Nadolny, the theme of the sea symbolizes resilience and continuity. It emphasizes how the sea can withstand the passage of time and the impact of external forces, reflecting an enduring presence that remains unaffected by transient events. The notion that "a thousand brisk left no trace on him" highlights this robustness, suggesting that despite challenges, the essence of the sea remains intact.

The text also conveys that the changing appearance of the sea does not diminish its constancy. It exists as a source of comfort and stability, signifying that as long as the sea is present, there is a hope for joy in the world. This duality of constant change yet persistent existence serves to illustrate the sea's vital role in shaping a positive perspective on life.