Enlightenment rationalism made medical science the ground of morality.

Evidence

That shift also served to separate healthy from unhealthy states of mind and behavior, and led—in the thought of Enlightenment rationalism—to the doctrine that morality be based on medical science rather than the other way around, as the older Christian view had it. — Talal Asad, Formations of the Secular, 220

Categorization

• QUESTION: This inversion of the morality-grounds-medicine relationship is striking—worth tracing how it actually played out in 18th-century medical ethics and where Christian residues survived inside it.