In William Shakespeare's "Henry VI, Part 1," the line "No, no, I am but shadow of myself: You are deceived, my substance is not here" reflects a deep sense of loss and identity crisis. The character acknowledges a disconnection between their true self and their current existence, suggesting that they feel like a mere ghost of who they once were. This moment encapsulates the theme of internal struggle and the impact of external circumstances on one's sense of self.

This quote signifies a poignant realization that one’s essence or "substance" has been undermined by events or conflicts, leading to a diminished sense of self. It urges the audience to contemplate the fragility of identity in the face of overwhelming challenges, a recurring motif in Shakespeare's works. Through this introspection, the character invokes a broader commentary on the human condition, emphasizing the struggle to maintain one's identity amidst turmoil.