True knowledge comes with deep understanding of a topic and its inner workings.

There have already been published by the bucketsful such brazen lies and utter fictions about me that I would long since have gone to my grave if I had allowed myself to pay attention to them.

My pacifism is an instinctive feeling, a feeling that possesses me because the murder of men is disgusting. My attitude is not derived from any intellectual theory but is based on my deepest antipathy to every kind of cruelty and hatred.

Agreements about what is good or not, are usually not worth much. It is very much like art, is it not an art to lead a good life?

The concept of marriage must have been thought up by an unimaginative pig.

One who scorns the power of intuition will never rise above the ranks of journeyman calculator.

There exists a passion for comprehension, just as there exists a passion for music. That passion is rather common in children, but gets lost in most people later on. Without this passion there would be neither mathematics nor natural science.