Theory:

Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveller, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;
 
 
Then took the other, 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 travelled by,
And that has made all the difference.
 
                                     Robert Frost
Reference:
National Council of Educational Research and Training (2006). Beehive. The Road Not Taken - Robert Frost (pp. 15). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.