"So the heart is the beginning of life, the Sun of the Microcosm, even as the Sun deserves to be call'd the heart of the world; for it is the heart by whose virtue and pulsation the blood is moved, perfected, made apt to nourish, and is preserved from corruption and coagulation; it is the household divinity which, discharging its function, nourishes, cherishes, quickens the whole body, and is indeed the foundation of life, the source of all action."

                                                                                                   William Harvey, 1628