No further evidence is needed to show that 'mental illness' is not the name of a biological condition whose nature awaits to be elucidated, but is the name of a concept whose purpose is to obscure the obvious.

Summary

This quote suggests that the term "mental illness" is not a scientific description of a biological condition, but rather a concept designed to obscure the clear understanding of certain issues. It implies that mental health problems might have underlying causes that are more complex than a simple physical or biological explanation, and that our current understanding of mental health is limited by this concept.