Parallelism

Parallelism is the use of the same grammatical form for two or more elements that belong together, so the structure of the sentence shows the reader that the ideas are of equal kind and weight.

He came for the money, stayed for the work, and left because of the people.

Three clauses, all built the same way: verb, then reason. The repetition of shape is what makes the sentence feel finished — the reader recognises the pattern after the second item and hears the third as an arrival.

Break the pattern and the sentence sags:

He came for the money, the work was what kept him there, and the people were why he left.

Same information, no shape at all. That is faulty parallelism, and it is one of the commonest notes in a line edit. It turns up most often in lists, in headings, and after a correlative conjunction, where the two halves of the pair must match exactly.

Caesar gives the compressed version — Veni, vidi, vici, three verbs, one shape, three words — and it has survived two thousand years on structure alone.

Parallelism is also the foundation other figures are built on. Set two parallel clauses against each other and you get antithesis. Repeat the opening words of each and you get anaphora. Reverse the order in the second and you get chiasmus. Learn this one and the rest are variations.