"Anyone who has never made a mistake has never tried anything new."

"If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut."

"A man should look for what is, and not for what he thinks should be."

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

"The only reason for time is so that everything doesn't happen at once."