Quote by 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."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."