Repetition is the simple repeating of a word, within a sentence or a poetical line, with no particular placement of the words, in order to provide emphasis, clarity, amplification, or emotional effect. This is such a common literary device that it is almost never even noted as a figure of speech. An example of repetition can be found in Natalia Ginzburg's The Little Virtues:
Today, as never before, the fates of men are so intimately linked
to one another that a disaster for one is a disaster for everybody.
The repetition in the aforementioned poem is the word 'disaster'. This rhetorical device can be found in many other figures of speech, such as: anaphora, which is the repetition of a word or phrase at the beginning of every clause; diaphora, is the repetition of a name, first to signify the person or persons it describes, then to signify its meaning; and polyptoton which repeats words derived from the same root but with different endings. All in all effective repetition is a device for writers to repeat themselves imaginatively, forcefully, thoughtfully, and strategically.