Exergasia (from the Greek εξ, ex, "out" and εργον, ergon, "work") is a form of parallelism where one idea is repeated and only the way it is stated is changed.
[2] This device of parallelism was first identified by the twelfth-century Jewish scholars Abraham Ibn Ezra and Joseph Kimhi, who referred to it as "kefel 'inyan be-millot shonot" ("doubling of the thought with other words").
[4] The Bishop Robert Lowth identified specific types of parallelism and further defined the concept in the late eighteenth century.
Repetition is a good way of making a point, but without the restatement of the idea it tends to become boring.
[7] Florizel calls the hand white in three different ways: comparing it to dove's down, an Ethiopian's tooth, and snow.