William Harvey — "The causes of diseases are often hidden, and to find them requires much labor an…"
The causes of diseases are often hidden, and to find them requires much labor and diligence.
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More from William Harvey
"The heart is the beginning of life; the sun of the microcosm."
"The circulation of the blood is a miracle of nature."
"The blood, therefore, moves in a circuit, and is impelled by the heart."
"The heart is the beginning of life, and the source of all motion."
"I have myself, in my dissections, seen the blood flow from the right ventricle into the pulmonary artery, and from the pulmonary vein into the left auricle."
About William Harvey (1578-1657)
English physician whose On the Motion of the Heart and Blood in Animals (1628) demonstrated blood circulation, overturning 1,400 years of Galenic medicine. Closely associated with Francis Bacon (his contemporary in the new English empiricism). For an intellectual contrast, see Galenic medicine, the 2nd-century Greek medical tradition (humors, blood-as-consumed-fuel) — Harvey calculated that the heart pumps more blood per hour than the body could possibly produce as fuel — a single quantitative observation that demolished the entire Galenic-Aristotelian medical worldview. The cleanest example in medical history of arithmetic disproving 14 centuries of authority.
Details
A statement on the challenges of medical diagnosis and etiology.
Date: Uncertain (attributed)
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Understanding this quote
What it means
Diseases rarely announce their origins. Diagnosing illness demands persistent, careful investigation rather than assumption or surface observation. A physician must work methodically, accepting that answers are buried beneath symptoms and require sustained intellectual effort to uncover. Understanding what makes someone sick is fundamentally a labor of discovery, not passive reception.
Relevance to William Harvey
Harvey embodied this principle through his decades-long investigation into blood circulation, overturning Galenic dogma held for 1,400 years. His 1628 De Motu Cordis resulted from meticulous dissection and quantitative experiment. He knew firsthand that anatomical truth hides beneath received wisdom, and that finding it demands relentless, unglamorous labor against institutional resistance.
The era
In the early modern period, medicine inherited Galenic humoral theory as unchallengeable doctrine. Physicians diagnosed by tradition rather than investigation. Harvey worked as anatomy began displacing ancient authority, yet causes of most diseases remained completely opaque. Without germ theory, microscopy, or chemistry, hidden causation was the norm, making diligent empirical searching the only honest path forward.
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