"Some people stay far away from the door if there's a chance of it opening up. They hear a voice in the hall outside and hope that it just passes by."

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The natural scientists of the previous age knew less than we do and believed they were very close to the goal: we have taken very great steps in its direction and now discover we are still very far away from it. With the most rational philosophers an increase in their knowledge is always attended by an increased conviction of their ignorance.

— Georg C. Lichtenberg