Robert Frost's Themes of Isolation, Extinction, and Limitations of Man Three of Frost’s obsessive themes, those of isolation, of extinction and of final limitations of man are explored widely and explicitly in his poems. The isolation of the individual is apparent in the poem; “Mending Wall” in which Frost’s illustrates man’s necessity for barriers to isolate themselves from their fellow men whereas in “Stopping by the Woods on a Snowy Evening” the persona himself wishes to be isolated. In “After Apple-Picking” Frosts questions the possibility of extinction of the soul when