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

"If you want to live a happy life, tie it to a goal, not to people or things."

"The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives."

"I am a deeply religious nonbeliever. This is a somewhat new kind of religion."

"He called the patent office 'that worldly cloister where I hatched my most beautiful ideas'."