Answer: the theme of The Road Not Taken is having choices we have to make, many of which affect the rest of our lives.
This is the theme because the author uses two trail-heads to symbolize a big choice in his life, and they define the rest of his life, as more choices will spring up depending on which on he chooses. He cannot choose both, because one cannot walk two trails, as it is impossible to be at two places at once.
“Yet knowing how WAY LEADS ON TO WAY, I doubted if I SHOULD EVER COME BACK.” These lines both describe that once you choose something, their is no way to go back, and this choice will continue to determine the rest of your life, and more choices will result from this.
“I took the ROAD LESS TRAVELED BY, and that has made ALL THE DIFFERENCE.” This means he took the less popular path, as something popular is not always the best course to go with, and that has made a big impact on his life.
Explanation: