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

Don't believe the results of experiments until they're confirmed by theory.

We often think that when we have completed our study of one we know all about two, because 'two' is 'one and one.' We forget that we still have to make a study of 'and.'

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

It is impossible to trap modern physics into predicting anything with perfect determinism because it deals with probabilities from the outset.

You cannot disturb the tiniest petal of a flower without the troubling of a distant star.

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.