This passage reinforces the main points of Naphta’s and Settembrini’s respective attitudes toward illness, suffering, and the body. Settembrini disparages illness because it attacks the mind (or soul), which is fundamentally rational and good, by exposing the limitations of the physical body. Naphta, on the other hand, glorifies illness for exposing the fundamental truth of humankind: that it “[i]s ill by nature.” Again, Naptha’s logic bears notable similarities to Krokowski’s psychoanalytic theories, notably the underlying assumption that, at their core, all humans are fundamentally irrational.