The mathematics is not there till we put it there.

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.'

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

Unless the structure of the nucleus has a surprise in store for us, the conclusion seems plain — there is nothing in the whole system of laws of physics that cannot be deduced unambiguously from epistemological considerations.

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'.

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

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