A rhetorical technique, otherwise known as a 'device' or 'figure of speech', is a deliberate use of language aimed at making a point memorable, impactful and persuasive. Although most originated in Ancient Greece, they are still used by politicians and business leaders today to great effect. There are literally dozens of techniques, too many to mention here.
Douglass is using the technique of repetition.
Rhetorical technique is when a person uses unique styles or ways to spread his views, such as as in political venues. Rhetorical strategy, however, is when one uses a certain word or action to provoke or trigger emotions in an attempt to gain his audience's confidence. In this kind of strategy, the speaker may sometimes use hyperbole symbols based on rhetoric.
A bias fallacy is a mistaken believed based on an unsound argument based on bias. An example of bias fallacy would be "Mitt Romney can't be a good leader because he is Mormon." Rhetorical device is a technique used by a writer to get an emotional response. Antithesis is a form of rhetorical device which juxtaposes different ideas such as "Not that I loved Caesar less, but that I loved Rome more."
logos
Repetition !
parallelism
In what excerpt? Can you provide the text so I can analyze it and identify the specific rhetorical technique that is most prominent in it?
Rhetorical device
The tropical thing
Understatement
pathos
Apex perallelism
Rehearsing discussion response
The most prominent rhetorical technique in that excerpt is a repetition, specifically an anaphora, where the phrase "I have never been a quitter" is repeated for emphasis and to drive home the point.
The rhetorical technique most prominent in this excerpt is anaphora, where the phrase "I have never" is repeated at the beginning of successive clauses for emphasis on the speaker's determination and perseverance.
Ethos
Rhetorical question ........ Apex