Unfortunately or otherwise, people are prone to believe in the reality of the things they think ought to be so. This comes of the cheery optimism which is innate with life itself; and, while it may sometimes be deplored, it must never be censured, for, as a rule, it is productive of more good than harm, and of about all the achievement there is in the world. There are cases where this optimism has been disastrous, as with the people who lived in Pompeii during its last quivering days; or with the aristocrats of the time of Louis XVI, who confidently expected the Deluge to overwhelm their children, or their children’s children, but never themselves.