The narrator is indeed plagued by the contrary urges to stop and admire the beauty and mystery of the snowy scene, whilst also compelled to resume his lengthy journey. He acknowledges the confusion that his horse must feel, and a spectator may assume in seeing someone choosing to stop in such an isolated area, in such conditions and in the midst of winter-
The darkest evening of the year.
The narrator appears torn between the beauty and majesty of the scene in front of him and the trials of the long journey ahead-
The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep.