Both in thought and in feeling, even though time be real, to realise the unimportance of time is the gate of wisdom.

A word is used "correctly" when the average hearer will be affected by it in the way intended. This is a psychological, not a literary, definition of "correctness". The literary definition would substitute, for the average hearer, a person of high education living a long time ago; the purpose of this definition is to make it difficult to speak or write correctly.

The military superiority of Europe to Asia is not an eternal law of nature, as we are tempted to think, and our superiority in civilization is a mere delusion.

Beware the man of the single book

Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.

Zeno was concerned with three problems... These are the problem of the infinitesimal, the infinite, and continuity.

To like many people spontaneously and without effort is perhaps the greatest of all sources of personal happiness.