Nothing puts a greater obstacle in the way of the progress of knowledge than thinking that one knows what one does not yet know.
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.
There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.
The most heated defenders of a science, who cannot endure the slightest sneer at it, are commonly those who have not made very much progress in it and are secretly aware of this defect.
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