"We must make our nervous system our ally instead of our enemy."

"Most people never run far enough on their first wind to find out they've got a second."

"The greatest enemy of any one of our truths may be the rest of our truths."

"The more original a discoverer, the more he is apt to be regarded as a lunatic at first."

"There is no more miserable human being than one in whom nothing is habitual but indecision."