It is in literature that the concrete outlook of humanity receives its expression.

People make the mistake of talking about 'natural laws.' There are no natural laws. There are only temporary habits of nature.

The point about zero is that we do not need to use it in the operations of daily life. No one goes out to buy zero fish. It is in a way the most civilised of all the cardinals, and its use is only forced on us by the needs of cultivated modes of thought.

It belongs to the self-respect of intellect to pursue every tangle of thought to its final unravelment.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

Our reasonings grasp at straws for premises and float on gossamers for deductions.

It does not matter what men say in words, so long as their activities are controlled by settled instincts. The words may ultimately destroy the instincts; but until this has occurred, words do not count.