The mind has great influence over the body, and maladies often have their origin there.

The line asserts a psychosomatic principle: mental states—fear, anxiety, obsession, suggestion—can materially affect physical health, even to the point of generating or worsening illness. Read in a Molièrean key, it also fits his recurring satire of medical pretension and fashionable hypochondria: people (and doctors) may misread bodily symptoms when the true driver is the imagination or the passions. At the same time, the statement is not merely comic; it anticipates later mind–body thinking by insisting that the “mind” is not an abstract realm but a causal force within embodied life. The quote’s enduring appeal lies in its concise challenge to purely mechanical views of disease.