"Insanity: doing the same thing over and over again and expecting different results."

"The important thing is not to stop questioning. Curiosity has its own reason for existence."

"In order to form an immaculate member of a flock of sheep one must, above all, be a sheep."

"Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person."

"He who can no longer pause to wonder and stand rapt in awe, is as good as dead, his eyes are closed."

"It has become appallingly obvious that our technology has exceeded our humanity."

"Once you stop learning, you start dying."

"A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy?"

"The world, as we have created it, is a process of our thinking. It cannot be changed without changing our thinking."

"Any fool can know. The point is to understand."

"If you can't explain it to a six year old, you don't understand it yourself."

"Genius is 1% talent and 99% hard work."

"Black holes are where God divided by zero."

"You never fail until you stop trying."

"A clever person solves a problem. A wise person avoids it."