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"Setting an example is not the main means of influencing others; it is the only means."
"Anyone who has never made a mistake has never tried anything new."
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"If A equals success, then the formula is: A=X+Y+Z. X is work. Y is play. Z is keep your mouth shut."
"Not everything that counts can be counted, and not everything that can be counted counts."
"Look deep into nature, and then you will understand everything better."
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"There are two ways to live your life - one is as though nothing is a miracle, the other is as though everything is a miracle."
"It's not that I`m so smart, it's just that I stay with problems longer."
"A man's ethical behavior should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death."
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"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity."
"Everything should be made as simple as possible, but not simpler."
"We can't solve problems by using the same kind of thinking we used when we created them."
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"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."
"Intellectuals solve problems; geniuses prevent them."
"Peace cannot be kept by force. It can only be achieved by understanding."
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"The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day."
"Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence."