Now or Never by Oliver Optic

Bobby had a poorer opinion of human nature than ever before. It seemed almost incredible to him that words so fairly spoken as those of Tom Spicer could be false. He had just risen from a sick bed, where he had had an opportunity for long and serious reflection. Tom had promised fairly, and Bobby had every reason to suppose he intended to be a good boy. But his promises had been lies. He had never intended to reform, at least not since he had got off his bed of pain. He was mortified and disheartened at the failure of this attempt to restore him to himself.

Like a great many older and wiser persons than himself, he was prone to judge the whole human family by a single individual. He did not come to believe that every man was a rascal, but, in more general terms, that there is a great deal more rascality in this world than one would be willing to believe.