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

"Nature is a free and open book, to be read and understood by all who have the patience and the power to do so."

"All we know is that the blood is in motion, but what sets it in motion is God’s secret."

"The pulse is nothing more than the impulsion of the blood into the arteries."

"The world is full of wonders, but man is the greatest wonder of all."