If Patrick Henry had said, "I'd give anything for liberty, even my life," we wouldn't be quoting him today.
Instead, he proclaimed, "Give me liberty, or give me death," to which his compatriots are said to have shouted, "To arms! To arms!" thereby responding emphatically to an emphatically rousing statement.
His emphasis came not only from the drama and bravado of the moment, but also from one of the simplest and most useful stylistic devices in language: repetition.
There are many types.
Simple repetition creates the rising intensity of parallel structure, as it did when Martin Luther King declared on the steps of the Lincoln Memorial, "I have a dream that one day … I have a dream that one day. …"
Repetition at the beginnings and endings of successive phrases creates a special kind of emphasis, as it did in Henry's 1775 speech to the Virginia Convention ("Give me … or give me …") and in Lincoln's 1863 Gettysburg Address ("… government of the people, by the people and for the people").
When Marcus Tullius Cicero, Marcus Fabius Quintilianus and other classical rhetoricians opened successive phrases with repeated words, they called it anaphora; when they closed successive phrases with the same words, they called it epistrophe.
The opening of Charles Dickens' "A Tale of Two Cities" is a famous example of anaphora: "It was the best of times, it was the worst of times, it was … it was … it was. …"