The mathematics is not there till we put it there.

Whatever else there may be in our nature, responsibility toward truth is one of its attributes.

There is only one law of Nature-the second law of thermodynamics-which recognises a distinction between past and future more profound than the difference of plus and minus. It stands aloof from all the rest. ... It opens up a new province of knowledge, namely, the study of organisation; and it is in connection with organisation that a direction of time-flow and a distinction between doing and undoing appears for the first time.

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

The mathematics is not there till we put it there.

If an army of monkeys were strumming on typewriters, they might write all the books in the British Museum.

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