"Ignorance is a failure to think deeply. It is a failure to be inquisitive. It is a failure to keep an open mind."

"Those who cannot remember the past are condemned to repeat it."

"When cure is possible, is it necessary, and when cure is necessary, is it possible?"

"Sooner or later, nature will look you in the eye, and after making sure that you are paying attention, give you the middle finger."

"Say what you know, what you don't know, and what you believe -- and label it accordingly."