Who said the quote woods are dark and deep?

The quote "woods are dark and deep" is from the poem "Stopping by Woods on a Snowy Evening" by Robert Frost. The poem is about a man who stops his horse to admire a snowy forest. The speaker is struck by the beauty of the forest, but he also feels a sense of foreboding. The poem ends with the speaker saying, "The woods are lovely, dark and deep, / But I have promises to keep, / And miles to go before I sleep."