“How can one look happy when he is thinking about the anomalous Zeeman effect?”
Writings on Physics and Philosophy (1994), p. 15
Context: A colleague who met me strolling rather aimlessly in the beautiful streets of Copenhagen said to me in a friendly manner, “You look very unhappy”; whereupon I answered fiercely, “How can one look happy when he is thinking about the anomalous Zeeman effect?”.
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Wolfgang Pauli 35
Austrian physicist, Nobel prize winner 1900–1958Related quotes

“He could even think about how fast he was thinking about things.”
Source: Peter and the Starcatchers

“What can man know about happiness except how to write it?”
Statek (1994)

Ch 10
The Little Lame Prince and his Travelling Cloak (1875)
Context: Thus King Dolor's reign passed, year after year, long and prosperous. Whether he was happy — "as happy as a king" — is a question no human being can decide. But I think he was, because he had the power of making everybody about him happy, and did it too; also because he was his godmother's godson, and could shut himself up with her whenever he liked, in that quiet little room in view of the Beautiful Mountains, which nobody else ever saw or cared to see. They were too far off, and the city lay so low. But there they were, all the time. No change ever came to them; and I think, at any day throughout his long reign, the King would sooner have lost his crown than have lost sight of the Beautiful Mountains.
Source: 1960s - 1970s, The Systems Approach (1968), p. 35