When an investigator has developed a formula which gives a complete representation of the phenomena within a certain range, he may be prone to satisfaction. Would it not be wiser if he should say 'Foiled again! I can find out no more about Nature along this line.'

In the most modern theories of physics probability seems to have replaced aether as "the nominative of the verb 'to undulate'."

There is no space without aether, and no aether which does not occupy space.

Electrical force is defined as something which causes motion of electrical charge; an electrical charge is something which exerts electric force.

In any attempt to bridge the domains of experience belonging to the spiritual and physical sides of nature, time occupies the key position.

The quest of the absolute leads into the four-dimensional world.

[When thinking about the new relativity and quantum theories] I have felt a homesickness for the paths of physical science where there are ore or less discernible handrails to keep us from the worst morasses of foolishness.