Our entire much-praised technological progress, and civilization generally, could be compared to an axe in the hand of a pathological criminal.

The mere formulation of a problem is far more essential than its solution, which may be merely a matter of mathematical or experimental skills. To raise new questions, new possibilities, to regard old problems from a new angle requires creative imagination and marks real advances in science.

Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.

No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].

The life of the individual has meaning only insofar as it aids in making the life of every living thing nobler and more beautiful. Life is sacred, that is to say, it is the supreme value, to which all other values are subordinate.

Look deep into nature, and then you will understand everything better.

He who cherishes the value of cultures cannot fail to be a pacifist.