What is an example of parallelism?

An example of parallelism is the phrase “Easy come, easy go.” Like many common sayings, its purpose is to be memorable, and this is achieved through parallel structure: both “easy come” and “easy go” follow the same structure of an adverb (“easy”) modifying a verb (“come” and “go”). This creates a symmetry which reinforces the idea of equivalence—that things gained easily are lost just as easily.