The dividing line between the wave or particle nature of matter and radiation is the moment “Now.” As this moment steadily advances through time it coagulates a wavy future into a particle past.

[Presently, science undergraduates] do not learn to write clearly and briefly, marshalling their points in due and aesthetically satisfying order, and eliminating inessentials. They are inept at those turns of phrase or happy analogy which throw a flying bridge across a chasm of misunderstanding and make contact between mind and mind.

The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

God runs electromagnetics by wave theory on Monday, Wednesday, and Friday, and the Devil runs them by quantum theory on Tuesday, Thursday, and Saturday.