Setting opposing ideas or words side by side, so that one illuminates the other through contrast.
In Inferno
Of all malice that draws hatred in heaven the end is injustice, and every such end afflicts another either by force or by fraud. But because fraud is the evil proper to man, it displeases God more; and therefore the fraudulent remain below, and more pain assails them.
The sentence sets two poles face to face, the evil done "by force" and the evil done "by fraud", and immediately opposes one to the other: fraud is proper to man and displeases God more. The contrast organizes the rest of Hell.
O blind greed and mad wrath, that so goad us in the short life and then soak us so badly in the eternal one!
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we were men, and now we have become stumps: your hand should indeed be more merciful, even if we had been souls of serpents.
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the face of his was the face of a just man, so benign was the skin outside, and the rest of the body that of a serpent.
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look how he made a chest of his back; because he wanted to see too far ahead, he looks behind and walks backward.
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outside they are gilded, so much so that they dazzle; but inside all of lead, and so heavy that those of Frederick, beside them, were of straw.
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as long as I was the form of bones and flesh that my mother gave me, my works were not those of the lion, but of the fox.
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for one cannot absolve whoever does not repent, nor repent and will at the same time, because the contradiction does not allow it.
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