“Perhaps he confused cause and effect; the excellent digestion may have been responsible for at least some of the philosophical serenity.”
The narrator humorously reverses a character’s explanation of his calm temperament, using causal inversion to puncture self-satisfied philosophy.
Source details
When William Came, represented by Project Gutenberg #14540 from the 1914 John Lane edition. This is the narrator’s satirical aside about Herr von Kwarl; the digestion comparison is literary humor, not medical or psychological advice.