The literary term used in the underlined portion is allusion. This is because the speaker is making a reference to Hercules and Samson, two famous mythological figures known for their strength, to help express his thoughts.
It's an allusion.
If you are ever unsure about underlines and quotes just remember short literary works go in quotes and long ones get underlined or italicized. So for a poem- it depends. For The Illiad you would use underlines or italics because it is a work unto itself. "I Hear America Singing" would get quotes since it's pretty short and part of a collection. I don't know if there's an actual rule of thumb on this, "Song of Myself" would be tricky since it's about 75 pages long, but I would say if it could be published on its own then it gets italics/underlines but if it's part of a collection then you would do quotes.
In a literary response essay, the title "A Separate Peace" should be italicized, not underlined or in quotations. Italicizing is the preferred way to indicate a title of a book or novel within a piece of writing.
literary and non literary
What is meaning of literary
Literary appreciation is the understanding and mastery of the form and content of a literary work.
A literary theme is the moral of a story.
artistic in literary
Literary nonfiction includes vivid descriptions.
The Literary Digest was created in 1890.
The Literary Digest ended in 1938.
Literary Machines was created in 1980.