Oh, my bitter dreams. I cultivate furrow after furrow.

This couplet speaks about the contrast between dreams and reality. 'Salty dreams' refers to experiences or aspirations that have turned bitter, leaving a sense of disappointment or sorrow. Despite these harsh feelings, the speaker says, 'I cultivate many, many fields.' This signifies a commitment to hard work, perseverance, and bringing things to fruition. It beautifully captures the human spirit's ability to continue striving, creating, and nurturing, even when faced with unfulfilled hopes. It's about finding purpose and growth through diligent effort, regardless of the emotional challenges.