What might Frost be referring to when he declares, “Yet knowing how way leads on to way, I doubted if I should ever come back”? (lines 13-15)
In these lines, Frost is referring to choice. Once a person has decided on a particular route, it is doubtful whether one would ever have the opportunity to return to the original choice and thus decide again. This is because once a decision has been made, one is taken on a route where other choices have to be made based on the original decision. One route leads to another and another and so on. In the end, one could be left so far from the original choice that the chance of starting over becomes nearly impossible.
It is this doubtfulness of an original decision that Frost questions in the poem. One can never be quite certain that an initial choice was the right one. There is only the question of, 'What if I had decided...
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