"The Defenseless Philosopher Quincas Borba" is an ironic novel by the Brazilian writer Machado de Assis, which tells the story of a mad idealist philosopher who believes in the principle of "Humanitarian Transit". The main character, Rubias, inherits a large inheritance from his friend Quincas Borba, undergoes a series of misunderstandings and tragic events. The novel is observed as a deep analysis of a society where good and evil, justice and corruption intertwine in positive and tragic ways. Quincas Borba inspires the reader to think about the nature of human nature and its desire for good.