Determining the Central Theme in a Poem

In the poem 'The Road Not Taken' by Robert Frost, the speaker reflects on a decision made at a fork in the woods. The choice represents a significant moment in life where paths diverge, leading to different outcomes. The speaker acknowledges that, although both paths were appealing, they had to choose one, and this choice will affect their future. As the speaker contemplates this moment, they recognize that the decision may shape their identity and experiences.

Based on this summary, what is the central theme of the poem?