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"Absolute space, that is to say, the mark to which it would be necessary to refer the earth to know whether it really moves, has no objective existence."
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"The Earth's health is the only standard that is all-encompassing enough to overcome the ethnic, cultural, religious, and national tensions that are rending the world asunder. Only the Earth can become the central axis around which which world peace can be spun, for no religion is more compelling, no single nation larger, and no peoples older than the Earth itself. For that to happen, the collective human consciousness must expand enough so that our highest identification is as Earth-Humans."

"In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory."

"Loveliest of lovely things are they on earth that soonest pass away. The rose that lives its little hour is prized beyond the sculptured flower."

"Perhaps the thing that makes humans truly unique on Earth is that we are never satisfied with our situation; maybe that is what's taken us so far."

"There are no more new worlds. The unoccupied arable lands of the earth are limited, and will soon be taken."

"Germany can generally only pay if the Corridor and Upper Silesia will be handed back to Germany from Polish possession, and if besides somewhere on the earth colonial territory will be made available to Germany."

"Photographers deal in things which are continually vanishing and when they have vanished there is no contrivance on earth which can make them come back again."

"The way I see it, the earth is going to be here after we're dead and gone. Even if it's a polluted planet, and they messed it up. Where do they go from here - to another planet so they can mess that up too?"

"Who promised you that only for joy were you brought to this earth?"
Explore more quotes by Henri Poincare

"One would have to have completely forgotten the history of science so as to not remember that the desire to know nature has had the most constant and the happiest influence on the development of mathematics."

"If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living."

"If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing."

"To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection."

"It has adopted the geometry most advantageous to the species or, in other words, the most convenient."
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