The only real valuable thing is intuition. The intellect has little to do on the road to discovery

I know that it is a hopeless undertaking to debate about fundamental value judgements. For instance, if someone approves, as a goal, the extirpation of the human race from the earth, one cannot refute such a viewpoint on rational grounds. But if there is agreement on certain goals and values, one can argue rationally about the means by which these objectives may be obtained.

Nationalism is an infantile disease. It is the measles of mankind.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. He to whom the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.

But their intervention makes our acts to serve ever less merely the immediate claims of our instincts.

A model should be as simple as it can be but no simpler

...and knowledge is one of the finest attributes of man - though often it is most loudly voiced by those who strive for it the least.