... We are happy when we think ourselves happy,and with a strange perversity we often differ from others with regardto what should constitute our happiness... 
Charles W. Chesnutt 「The House Behind the Cedars」
...Consequently, they act accordingly? If we reject conventionalexplanations, and view the life of our upper and lower classes as it is, withall its shamelessness, it is only a vast perversity...
Leo Tolstoy 「The Kreutzer Sonata and Other Stories」
...Yet a bean-stalk willsometimes show a kind of perversity or depravitythat looks like the result of deliberate choice...
John Burroughs 「Ways of Nature」
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