In the Heart of the Seas (Hebrew: בלבב ימים) is a novella by Shmuel Yosef Agnon, one of Israel's most renowned authors and a recipient of the Nobel Prize in Literature in 1966. Published in 1934, the novella is one of Agnon's notable works, blending mysticism, tradition, and Jewish spirituality with a modern literary style.

The story follows a group of Jewish pilgrims traveling from Eastern Europe to the Land of Israel in the 19th century. Along their journey, the characters face physical and spiritual challenges, highlighting themes of faith, community, and devotion. The narrative weaves traditional Jewish folklore with allegorical elements, emphasizing the yearning for redemption and connection to the Holy Land.

• Jewish identity and tradition: The novella explores the significance of Jewish heritage and the deep connection to the Land of Israel.
• Faith and redemption: The journey symbolizes the spiritual struggle and perseverance required to achieve redemption.
• Community and unity: The characters' interactions reflect the strength of communal bonds in overcoming adversity.

Agnon’s writing is characterized by a unique blend of biblical and rabbinic language with modernist techniques. In the Heart of the Seas is celebrated for its poetic prose and ability to bridge traditional and contemporary Jewish literature.

The novella is considered a classic of modern Hebrew literature and is studied widely in Israeli schools and universities. It exemplifies Agnon’s mastery in capturing the essence of Jewish life and spirituality.