In Shakespeare's "Hamlet," the phrase "But break, my heart, for I must hold my tongue" reflects the profound internal conflict experienced by the character. This line captures the emotional turmoil he faces, as he grapples with his feelings and the necessity of restraint. The tension between his heart's desires and the obligation to remain silent illustrates the pain of unexpressed emotions.

This moment highlights the themes of grief, frustration, and the struggle for self-control in the play. Hamlet's inability to voice his sorrow leads to a deeper exploration of sorrow and the complexities of action and inaction, central to his character's journey throughout the narrative.