The heart of animals is the foundation of their life, the sovereign of everything within them, the sun of their microcosm, that upon which all growth depends, from which all power proceeds.
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"The causes of diseases are often hidden, and to find them requires much labor and diligence."
"I have not hesitated to present to you, my dear reader, the results of my anatomical observations."
"The heart is the household divinity which, discharging its function, nourishes, cherishes, quickens the whole body."
"The world is a living creature."
"The heart, like a pump, perpetually propels the blood."
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.
From 'De Motu Cordis', a poetic and grand description of the heart's importance.
Date: 1628
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The heart is not merely a pump but the central governing force of all animal life. Everything else in the body depends on it for growth, energy, and sustenance. Without it, nothing functions. It holds absolute authority over the body's inner world, acting as the source from which all vital power originates and flows outward to sustain existence.
Harvey discovered pulmonary and systemic blood circulation, published in Exercitatio Anatomica de Motu Cordis in 1628. This quote directly reflects his revolutionary finding that the heart actively pumps blood in a continuous circuit rather than the liver generating blood as Galen taught. His entire career centered on proving the heart's mechanical primacy, making this statement both scientific conclusion and professional conviction.
In early modern Europe, Galenic medicine still dominated, teaching that the liver produced blood consumed by organs. Harvey's era saw the Scientific Revolution challenging ancient authority through direct observation and experiment. Describing the heart as a 'sun' echoed Copernican heliocentrism, a bold analogy in an age when Copernicus had recently recentered the cosmos, suggesting Harvey deliberately invoked the new astronomy to elevate the heart's importance.
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