Chapter XX

The narrator introduces Martin, the old philosopher, boarding with Candide for Bordeaux, noting that both have suffered greatly and their shared experience of evil would sustain conversation throughout a long voyage.

Candide possesses two key advantages over Martin: hope of reuniting with Cunegonde and material wealth, which predispose him toward Pangloss's optimistic philosophy despite recent hardships.

Candide directly asks Martin for his philosophical views on moral and natural evil, opening the philosophical debate.

Martin identifies himself as a Manichean, explaining that he was accused of being a Socinian but asserts his true philosophical position.

Candide expresses disbelief that Manicheans still exist in the world, challenging Martin's claim.

Martin insists that he is indeed a Manichean and cannot think otherwise, asserting the inevitability of his philosophical position.

Candide jokingly suggests that Martin must be possessed by the devil to hold such dark views.

Martin elaborates on his Manichean beliefs by presenting a comprehensive catalogue of human suffering and evil—war, cruelty, poverty, envy—arguing that God has abandoned the world to a malignant being, with El Dorado as the sole exception.

Candide mildly counters that some things are good, making a minimalist optimistic claim.

Martin concedes the logical possibility of good but denies personal knowledge of it, closing the first philosophical exchange.

The debate is interrupted by the sound of cannon fire from a naval battle between two ships about three miles away, which the travelers observe in detail.

Martin uses the naval battle as a concrete example supporting his Manichean philosophy, commenting that this is how men treat one another.

Candide agrees with Martin's assessment, conceding that the violence they witnessed is indeed diabolical in nature.

One of Candide's lost sheep is found swimming near the vessel, and Candide expresses greater joy at recovering this single sheep than grief at losing a hundred laden with El Dorado's diamonds.

The French captain identifies the defeated Dutch captain as the very pirate who robbed Candide; the pirate's plunder is lost at sea, with only one sheep saved.

Candide points to the pirate's drowning as evidence that crime is sometimes punished and justice is served.

Martin objects that while the pirate was punished, innocent passengers were also destroyed, suggesting an amoral force (the devil) operates alongside divine punishment.

The ship continues its journey and Candide and Martin dispute for fifteen days without making progress, but their conversation, idea-sharing, and mutual consolation strengthen their bond.

Candide concludes that if he has recovered his lost sheep, he may also recover his beloved Cunegonde, returning to his hopeful outlook.