Which rhetorical device is used in this excerpt from G. K. Chesterton's "The Fallacy of Success"?

Turning over a popular magazine, I find a queer and amusing example. There is an article called "The Instinct that Makes People Rich." It is decorated in front with a formidable portrait of Lord Rothschild. There are many definite methods, honest and dishonest, which make people rich; the only "instinct" I know of which does it is that instinct which theological Christianity crudely describes as "the sin of avarice."

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