"The most important instrument a scientist has is his own mind."

"I am not afraid of failure, for it is through failure that we learn."

"The philosopher should be a man willing to listen to every suggestion, but determined to judge for himself."

"I have far more confidence in the one man who works mentally and bodily at a matter than in the six who merely talk about it."

"There's nothing quite as frightening as someone who knows they are right."