“The essence of mathematics is in its freedom.”

“My beautiful proof lies all in ruins.”

“Je le voie, mais je ne le crois pas.”

“The calculative exactness of practical life which the money economy has brought about corresponds to the ideal of natural science: to transform the world by mathematical formulas. Only money economy has filled the days of so many people with weighing, calculating, with numerical determinations, with a reduction of qualitative values to quantitative ones.”

“Slow down and enjoy life. It's not only the scenery you miss by going too fast - you also miss the sense of where you are going and why.”

“authoritarian institutions, such as governments and churches, do not use language but jargon, repetitive phrases that are not supposed to have meaning but merely enforce obedience. Language has its own internalizing ethic; it is individualistic and thus threatening to any monolithic system that demands a chorus or litany.”

“From the ethical point of view, no one can escape responsibility with the excuse that he is only an individual, on whom the fate of the world does not depend. Not only can this not be known objectively for certain, because it is always possible that it will depend precisely on the individual, but this kind of thinking is also made impossible by the very essence of ethics, by conscience and the sense of responsibility.”