Common sense needs constant reappraisal.

This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

I learned many years ago never to waste time trying to convince my colleagues.

There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.

Here's a Challenge: Study a complicated topic in such detail that anyone interested can nod their head and understand as you explain specific concepts within the topic.

If you do the same thing over and over again you cannot ever expect a different outcome.

Creating a new theory is not like destroying an old barn and erecting a skyscraper in its place. It is rather like climbing a mountain, gaining new and wider views, discovering unexpected connections between our starting points and its rich environment. But the point from which we started out still exists and can be seen, although it appears smaller and forms a tiny part of our broad view gained by the mastery of the obstacles on our adventurous way up.