"The beginning of knowledge is the discovery of something we do not understand."

"Creative thinking should be viewed as an essential supplement to, though not a replacement for, critical thinking."

"There is nothing training cannot do. Nothing is above its reach. It can turn bad morals to good; it can destroy bad principles and recreate good ones; it can lift men to angelship."

"Constant kindness can accomplish much. As the sun makes ice melt, kindness causes misunderstanding, mistrust and hostility to evaporate."

"I came to realize that life lived to help others is the only one that matters and that it is my duty...This is my highest and best use as a human."

"In physics, you don't have to go around making trouble for yourself - nature does it for you."

"Marriage is the only adventure open to the cowardly."

"A man does not sin by commission only, but often by omission."

"The price of seeing is silence."

"Some of the greatest love affairs I've known have involved one actor - unassisted."