False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

The most beautiful experience we can have is the mysterious. It is the source of all true art and science.

It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.

Scientific truth is always paradox, if judged by everyday experience, which catches only the delusive appearance of things.

Englishmen rarely cry, except under the pressure of the acutest grief; whereas in some parts of the Continent the men shed tears much more readily and freely.

A fair result can be obtained only by fully stating and balancing the facts and arguments on both sides of each question.