the road not taken  robert frost

Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;

Then took the other, as just as fair,
And having perhaps the better claim,
Because it was grassy and wanted wear;
Though as for that the passing there
Had worn them really about the same,

And both that morning equally lay
In leaves no step had trodden black.
Oh, I kept the first for another day!
Yet knowing how way leads on to way,
I doubted if I should ever come back.

I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I-
I took the one less traveled by,
And that has made all the difference.

The paradox of The Road Not Taken is that the choice has to be made between two roads that are equally fair.  He cannot travel both roads even though he wants to.  The solution is simple; he just needs to choose a road.  However, the situation is paradoxical because he decides to take the road less traveled by, even though they are both equally fair.