Sylvia Plath's poem expresses an intense relationship between love and suffering. The phrase "Love is the bone and sinew of my curse" suggests that love is both a fundamental part of her existence and a source of pain. It highlights the duality of love as a powerful force that can bring both joy and torment, revealing the complexity of human emotions.

In Plath's work, love becomes intertwined with her personal struggles and the burdens she carries. This line encapsulates the idea that love, while essential and foundational, can also feel like a curse that binds her in ways she cannot escape. The exploration of such themes is characteristic of Plath's poignant and often dark poetry.