How does Clerambault develop the theme of Self-Deception and Illusion?

Clerambault by Romain Rolland develops Self-Deception and Illusion across the chapters the companion marks for this theme.

The protagonist Clerambault is portrayed as a well-meaning but weak character who indulges in optimistic illusions about universal brotherhood and progress, blind to evil and contradictions, reflecting how individuals deceive themselves to avoid the burden of critical thought.

Clerambault's initial belief in universal brotherhood and the family's superficial harmony are contrasted with the harsh reality of war and public hostility, revealing the illusions that sustain both personal and national life.