William Harvey — "The arteries are the channels through which the blood is driven from the heart."

"The most important thing in life is to be useful."

"Without the circulation of the blood, there can be no true life."

"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 appeal to the evidence of my senses, and to the testimony of dissections."

"What remains to be said is of so novel and unheard of a character that I not only fear injury to myself from the envy of a few, but I tremble lest I have mankind at large for my enemies, so much to wo…"