What message do the last two lines of "Stopping by Woods on a Snowy Evening" convey? What is the significance of the repetition?

The final two lines of Frost's poem "Stopping by Woods on a Snowy Evening" convey the sheer distance the narrator still has to "go before I sleep." By repeating the line "And miles to go before I sleep," Frost utilizes "and" as an intensifier, with the second line seeming to compound its precedent, emphasizing the sense of distance. We know that the quietude of the poem is only an oasis in the journey of the speaker—on "the darkest evening of the year," pausing only "to see his woods fill up with snow," to the surprise of the horse used only to stopping "with a farmhouse near." The final two lines, then, symbolize the speaker re-embarking upon his original journey, with effort now redoubled after the pause.