We cannot solve our problems with the same thinking we used when we created them.
The true sign of intelligence is not knowledge but imagination.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Logic will get you from A to B. Imagination will take you everywhere.
Life is like riding a bicycle, to keep your balance you must keep moving
Great spirits have always encountered violent opposition from mediocre minds.
Everyone should be respected as an individual, but no one idolized.
The only source of knowledge is experience.
Look deep into nature, and then you will understand everything better.
Reality is merely an illusion, albeit a very persistent one.
Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Intellectuals solve problems, geniuses prevent them.
The difference between stupidity and genius is that genius has its limits.