A thesis has to be presentable... but don't attach too much importance to it. If you do succeed in the sciences, you will do later on better things and then it will be of little moment. If you don't succeed… — Paul Ehrenfest Copy Share Image
Einstein, my upset stomach hates your theory [of General Relativity]—it almost hates you yourself! How am I to' provide for my students? What am… — Paul Ehrenfest Copy Share Image
“If you [Robert Oppenheimer] intend to mount heavy mathematical artillery again during your coming year in Europe, I would ask you not only not to come to Leiden, but if possible not even to Holland, and just because I am really so fond of you and want to keep it that way. But if, on the contrary, you want to… — Paul Ehrenfest Copy Share
Don't be impatient with me. Bear in mind that I hop around among all of you big beasts like a harmless and helpless frog… — Paul Ehrenfest Copy Share Image
No two electrons in the same state? That is why atoms are so unnecessarily big, and why metal and stone are so bulky. — Paul Ehrenfest Copy Share Image
A thesis has to be presentable... but don't attach too much importance to it. If you do succeed in the sciences, you will do… — Paul Ehrenfest Copy Share Image
![“Einstein, my upset stomach hates your theory [of General Relativity]—it almost hates you yourself! How am I to' provide for my students? What am I to answer to the philosophers?!!” quote by Paul Ehrenfest](https://sms4smile.com/quotes/img-quotes/8bf/paul-ehrenfest-52330_answers_einstein-my-upset-stomach-hates-your-the_467759.jpg)
