The speaker is reflective, indecisive, and optimistic. "Sorry I could not travel both", "...looked down one...then took the other", and "both that morning equally lay", all show that the author thinks each path holds a different adventure and he doesn't know which one to take.
The author uses word choice by saying, "one traveler", "the other, as just as fair", "both that morning equally lay", and "I took the one less traveled by". These quotes display the narrator's optimism and how he struggles internally to choose a path.
"Yellow wood", "bent in the under growth", "grassy and wanted wear", are all examples of the author's use of imagery and details. They provide a descriptive image to the reader to imagine what the speaker is seeing
The author uses many types of figurative language and poetic devices, such as: imagery-"yellow wood", similes-"the other, as just as fair", and symbolism/metaphors- "I looked down one as far as I could". The author adds these literary elements to make it more interesting and create a clear image.
The author's insight on life is show when they write, "Two roads diverged in a yellow wood, and sorry I could not travel both." The theme is that sometimes in life there are difficult decisions that have to be made.