"When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again."

"The best way to cheer yourself is to cheer somebody else up."

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

"If we knew what it was we were doing, it would not be called research, would it?"

"Try not to become a man of success. Rather become a man of value."

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

"If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales."

"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."

"I have no special talents. I am only passionately curious."

"I must be willing to give up what I am in order to become what I will be."

"It is not that I'm so smart. But I stay with the questions much longer."

"If I were not a physicist, I would probably be a musician. I often think in music. I live my daydreams in music. I see my life in terms of music."

"Blind belief in authority is the greatest enemy of truth."

"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

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

"I speak to everyone in the same way, whether he is the garbage man or the president of the university."

"Never memorize something that you can look up."

"Imagination is everything. It is the preview of life's coming attractions."

"A question that sometimes drives me hazy: am I or are the others crazy?"

"Science without religion is lame, religion without science is blind."

"Love is a better master than duty."

"It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure."

"What is right is not always popular and what is popular is not always right."

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

"The measure of intelligence is the ability to change."

"The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science."

"Time is an illusion."

"Life is like riding a bicycle. To keep your balance, you must keep moving."

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

"Logic will get you from A to Z; imagination will get you everywhere."

"When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity."

"Peace cannot be kept by force; it can only be achieved by understanding."

"Whoever is careless with the truth in small matters cannot be trusted with important matters."

"You never fail until you stop trying."

"Reality is merely an illusion, albeit a very persistent one."

"Once you can accept the universe as matter expanding into nothing that is something, wearing stripes with plaid comes easy."

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

"Creativity is intelligence having fun."

"Gravitation is not responsible for people falling in love.”

"In the middle of difficulty lies opportunity."

"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it."

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."

"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

"Black holes are where God divided by zero."

"Everything must be made as simple as possible. But not simpler."

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

"Great spirits have always encountered violent opposition from mediocre minds."

"We all know that light travels faster than sound. That's why certain people appear bright until you hear them speak."