Quote by Hilbert, David
"A proof should be like a clear window pane through which one can see the truth."
More from Hilbert, David
"Mathematics is the foundation of all knowledge."
"One should as a rule respect public opinion in so far as is necessary to avoid starvation and to prevent one's work from being suppressed, but anything that goes beyond this is voluntary submission to an unnecessary tyranny."
"The infinite! No other question has ever moved so profoundly the spirit of man."
"Out of the paradise that Cantor has created for us, no one shall expel us."