Bonnie Trenga describes how to develop the skills to create parallelism in your writing. Parallel structures make it easier to read your prose and also provide an element of influence. Consider JFK's famous inauguration speech.
Bonnie lists the building blocks of parallel structures:
Parallel elements have the same weight and are often the same part of speech. Noun, noun, noun. Check. Adjective, adjective, adjective. Yep. Verb, verb, verb. Parallelism is all about equality; parallelism creates a nice rhythm in your sentence.