"Clouds are poems, and the most moving poems linger on the blackboard so long, written in cursive so lovely, they also exist inside our fingertips. We never really erase them at the end of the lesson."

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There was a seminar for advanced students in Zürich that I was teaching and von Neumann was in the class. I came to a certain theorem, and I said it is not proved and it may be difficult. Von Neumann didn't say anything but after five minutes he raised his hand. When I called on him he went to the blackboard and proceeded to write down the proof. After that I was afraid of von Neumann.

— George Polya