Diotallevi's Faith and Decline
Foucault's PendulumDiotallevi's cabalistic devotion supports the group's game until illness makes him interpret its fictional manipulation of sacred texts as a violation with bodily consequences.
increasing
Bearing strength in each event
decreasing
The Devout Skeptic

A Life of Interpretation
Faith in the search
Diotallevi treats the Torah's permutations as a discipline requiring patience, devotion, and moral preparation. He distrusts Belbo's computer because it promises results without the journey.
A playful collaborator
He nevertheless joins the Plan's invention, finding in its combinations a form of prayer. His participation blurs the distinction he once defended between sacred study and mechanical play.
Illness and Reinterpretation

The Body as Text
A diagnosis
Diotallevi develops cancer and undergoes treatment. As his condition worsens, he sees the disease through the language of letters, transposition, and the body's relation to sacred writing.
A warning to Belbo
He argues that jokingly rearranging the Book may have taught the body disorder. His explanation cannot be verified, but it expresses the guilt shared by the conspirators.
A Last Counsel

The Limits of Play
A dying friend's appeal
Diotallevi tells Belbo that the Torah cannot be manipulated casually and that their game may have crossed a boundary. He insists that the body and language are not separate.
An unresolved truth
Belbo leaves without accepting a clear explanation. Diotallevi's death makes the warning emotionally powerful while leaving its supernatural claims uncertain.
At the start of the publishing partnership
After the Plan expands
Shortly before his death