Enantiosis (e-nan-ti-o’-sis): Using opposing or contrary descriptions together, typically in a somewhat paradoxical manner.
Tomorrow I shall kill. The blood will flow, yet many people will be grateful. They will be grateful for the cuts of meat to sacrifice to the soft white clouds moving across the blue sky, to the light breezes that make tree branches hardly sway in the summer heat, and the empty quiet battlefields blessed with the quiet of peace: to Nuada, god of the sky, the wind, and war.
Definition courtesy of “Silva Rhetoricae” (rhetoric.byu.edu)