The Bell Curve by Charles Murray & Richard Herrnstein FTP: The Power of Repetition

Anaphora occurs when the speaker repeats the same words at the start of successive sentences or clauses. Anaphora generally serves two principal purposes. Returning to the same word creates a hammering effect; the repeated language is certain to be noticed, likely to be remembered, and readily conveys strong feeling.

That’s from Ward Farnsworth’s superb Classical English Rhetoric. A book every writer should read. The way he teaches it, you remember the structure, and the key here, repetition. Good writers repeat words or phrases as a way to argue a point, make emphasis, add rhythm, paint a picture, show passion, or concisely limn a particular thesis.