Seneca, the great philosopher of ancient Rome (4 bc–ad 65), was once accused by the empress Messalina of adultery. After the Senate sentenced Seneca to death, the emperor Claudius instead exiled him to Corsica, perhaps because he suspected the charge was false. This reprieve may have shaped Seneca’s view of thankfulness when he wrote: “. . . homicides, tyrants, thieves, adulterers, robbers, sacrilegious men, and traitors there always will be, but worse than all these is the crime of ingratitude.”