One of the most famous examples of parallel structure use might be Abraham Lincoln's "You can fool all of the people some of the time, and some of the people all the time, but you cannot fool all the people all the time." Many great speech makers and politicians used parallel structure in their speeches, including Martin Luther King Jr.
Parallel structure, or parallelism, is the technique of using patterns of words that are similar in some way to convey ideas that are closely related or of equal importance to each other. This technique, however, also enables a particular point to be driven home or highlighted while the language remains punchy, clear and to the point.
In practice, this means that parallelism, when applied to a sentence, removes certain unnecessary words which helps the reader or listener take in the information much more quickly and easily.
Additional famous examples include Martin Luther King's statement "We are not satisfied, and we will not be satisfied until justice rolls down like waters and righteousness like a mighty stream" and John F. Kennedy's "Ask not what your country can do for you; ask what you can do for your country."