How does the comparision to the lark reflect the change that the speaker experiences?

The comparison to the lark symbolizes the speaker's transformation from a state of confinement or despair to one of freedom and joy. Initially, the lark represents an ideal of liberation and optimism that the speaker yearns for. As the speaker's journey unfolds, this metaphor highlights their growing sense of hope and elevation, indicating a shift from darkness to light. Ultimately, the imagery of the lark signifies the speaker's newfound ability to embrace life and its possibilities.