Wikiquote:Quote of the day/February 1, 2013

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Any concepts or words which have been formed in the past through the interplay between the world and ourselves are not really sharply defined with respect to their meaning: that is to say, we do not know exactly how far they will help us in finding our way in the world. … It will never be possible by pure reason to arrive at some absolute truth.
~ Werner Heisenberg ~