Schrödinger's wave-mechanics is not a physical theory, but a dodge - and a very good dodge too.

Human life is proverbially uncertain; few things are more certain than the solvency of a life-insurance company.

The understanding between a non-technical writer and his reader is that he shall talk more or less like a human being and not like an Act of Parliament. I take it that the aim of such books must be to convey exact thought in inexact language... he can never succeed without the co-operation of the reader.

Something unknown is doing we don't know what-that is what our theory amounts to.

Who will observe the observers?

Every body continues in its state of rest or uniform motion in a straight line, except insofar as it doesn't.

The universe will finally become a ball of radiation, becoming more and more rarified and passing into longer and longer wave-lengths. The longest waves of radiation are Hertzian waves of the kind used in broadcasting. About every 1500 million years this ball of radio waves will double in diameter; and it will go on expanding in geometrical progression for ever. Perhaps then I may describe the end of the physical world as-one stupendous broadcast.