Everything you can imagine, nature has already created.

Schools need not preach political doctrine to defend democracy. If they shape men capable of critical thought and trained in social attitudes, that is all that is necessary.

The really valuable thing in the pageant of human life seems to me not the political state, but the creative, sentient individual, the personality; it alone creates the noble and the sublime, while the herd as such remains dull in thought and dull in feeling.

A conviction akin to religious feeling of the rationality or intelligibility of the world lies behind all scientific work of a high order.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

In order to be an immaculate member of a flock of sheep, one must above all be a sheep oneself.

There is no logical way to the discovery of these elemental laws. There is only the way of intuition, which is helped by a feeling for the order lying behind the appearance.