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"I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it."
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"We cannot measure time. We can only measure changes of life and the universe."

"I wouldn't ask too much of her,' I ventured. 'You can't change the past.''Can't change the past?' he cried incredulously. 'Why of course you can!"

"A broad margin of leisure is as beautiful in a man's life as in a book. Haste makes waste, no less in life than in housekeeping. Keep the time, observe the hours of the universe, not of the cars."

"Eternity is a mere moment, just long enough for a joke."

"The value of time is immeasurable."

"Sometimes I feel like if you just watch things, just sit still and let the world exist in front of you - sometimes I swear that just for a second time freezes and the world pauses in its tilt. Just for a second. And if you somehow found a way to live in that second, then you would live forever."

"Worrying about what happened on Monday, or, what might happen on Wednesday, is at the expense of one's Tuesday."
Explore more quotes by David Deutsch

"The overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests."

"The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy, but the ones that contain the deepest explanations."

"It is possible to build a virtual-reality generator whose repertoire includes every possible environment."

"Our best theories are not only truer than common sense, they make more sense than common sense."

"Quantum computation is... a distinctively new way of harnessing nature... It will be the first technology that allows useful tasks to be performed in collaboration between parallel universes."
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