Parallelism

parallelism: also referred to as parallel construction or parallel structure, this term comes from Greek roots meaning "beside one another." It refers to the grammatical framing of words, phrases, sentences, or paragraphs to give structural similarity. This can involve, but is not limited to, repetition of a grammatical element such as a preposition or verbal phrase

"She... wiped from his icy brow the cold death-sweat, and closed his eyes forever... none to wipe from her wrinkled brow the cold sweat of death..."
                                                                -Narrative of the Life of Frederick Douglass
                                                                             by Frederick Douglass

Frederick Douglass repeats the phrase "cold death-sweat" as "cold sweat of death" to draw comparisons and show the differences between the two people. In its first instance a slave is present to care for and comfort a dying master; however in its second instance the same slave is not allowed a caregiver at death. Douglass does this to show the injustices of slavery. Those who provide dedicated care for the master cannot have any tenderness or care at their death. Douglass is showing how treatment differs based on skin color. He is attempting to move the crowd to speak out and act against slavery and its injustices.