Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.

The point about zero is that we do not need to use it in the operation of daily life. No one goes out to buy zero fish.

What the learned world tends to offer is one second-hand scrap of information illustrating ideas derived from another second-hand scrap of information. The second-handedness of the learned world is the secret of its mediocrity.

Art is the imposing of a pattern on experience.

Without adventure civilization is in full decay.

It is not paradox to say that in our most theoretical moods we may be nearest to our most practical applications.

The ultimate metaphysical ground is the creative advance into novelty.