Probably the respect or stigma attaching to particular classes of actions arose from the fact that these classes of actions were—or were thought to be—beneficial or injurious to the society of the time; but it is also clear that this good or bad name once created clings to the action long after the action has ceased in the course of social progress to be beneficial in the one case, or injurious in the other; and indeed long after the thinkers of the race have discovered the discrepancy. And so in a short time arises a great confusion in the popular mind between what is really good or evil for the race and what is reputed to be so—the bolder spirits who try to separate the two having to atone for this confusion by their own martyrdom.

Defence of criminals: A criticism of morality (1889)