We cannot solve our problems with the same thinking we used when we created them.
Life is like riding a bicycle. To keep your balance, you must keep moving.
To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.
Weakness of attitude becomes weakness of character.
The true sign of intelligence is not knowledge but imagination.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.
Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Look deep into nature, and then you will understand everything better.
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