"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 "
-Jawahar Lal Nehru
Nehru said a lot of memorable things, but your quote above is from a poem "Stopping by Woods on a Snowy Evening" by Robert Frost
To give you the whole poem is a pleasure:
Whose woods these are I think I know.
His house is in the village, though;
He will not see me stopping here
To watch his woods fill up with snow.
My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.
He gives his harness bells a shake
To ask if there's some mistake.
The only other sound's the sweep
Of easy wind and downy flake.
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.
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