That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.

Education which is not modern share the fate of all organic things which are kept too long.

A science which hesitates to forget its founders is lost.

The consequences of a plethora of half-digested theoretical knowledge are deplorable.

Inventive genius requires pleasurable mental activity as a condition for its vigorous exercise. "Necessity is the mother of invention" is a silly proverb. "Necessity is the mother of futile dodges" is much closer to the truth. The basis of growth of modern invention is science, and science is almost wholly the outgrowth of pleasurable intellectual curiosity.

Our minds are finite, and yet even in these circumstances of finitude we are surrounded by possibilities that are infinite, and the purpose of life is to grasp as much as we can out of that infinitude.

There is a tradition of opposition between adherents of induction and of deduction. In my view it would be just as sensible for the two ends of a worm to quarrel.