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"It is far better to foresee even without certainty than not to foresee at all."
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"The areas of consensus shift unbelievably fast; the bubbles of certainty are constantly exploding."

"When we deal with questions relating to principles of law and their applications, we do not suddenly rise into a stratosphere of icy certainty."

"One must verify or expel his doubts, and convert them into the certainty of Yes or NO."

"Could we have prevented in 100% certainty? I don't think anything is that certain. However, we would have had a very, very good chance for preventing it."

"No great deed is done by falterers who ask for certainty."

"You can safely appeal to the United Nations in the comfortable certainty that it will let you down."
Explore more quotes by Henri Poincare

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

"Invention consists in avoiding the constructing of useless contraptions and in constructing the useful combinations which are in infinite minority."

"If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment."

"Science is built up of facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house."
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