  The Persian Letters is both one of the funniest books written by a major philosopher, and one of the bleakest. It presents both virtue and self-knowledge as almost unattainable. Almost all the Europeans in the Persian Letters are ridiculous; most of those who are not appear only to serve as a mouthpiece for Montesquieu's own views. Rica is amiable and good-natured, but this is largely due to the fact that, since he has no responsibilities, his virtue has never been seriously tested. For all Usbek's apparent enlightenment and humanity, he turns out to be a monster whose cruelty does not bring him happiness, as he himself recognizes even as he decides to inflict it. His eunuchs, unable to hope for either freedom or happiness, learn to enjoy tormenting their charges, and his wives, for the most part, profess love while plotting intrigues. The only admirable character in the novel is Roxana, but the social institutions of Persia make her life intolerable: she is separated from the man she loves and forced to live in slavery. Her suicide is presented as a noble act, but also as an indictment of the despotic institutions that make it necessary.