William Harvey — "The circulation of the blood is a miracle of nature."

"There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience, or derived in some way from our senses."

"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."

"The physician must be a man of experience."

"Man comes into the world naked and unarmed, as if nature had destined him for a social creature, and ordained him to live under equitable laws and in peace..."

"I have seen the testicles of a hanged man twitch for a full hour after death, as if they still longed for life."