We cannot define. Nothing has ever been finally figured out, because there is nothing final to figure out

Nobody ever seemed quite clear whether the expression "drunk as a lord" should be taken as a compliment or an insult.

there is a physical problem that is common to many fields, that is very old, and that has not been solved. It is not the problem of finding new fundamental particles, but something left over from a long time ago — over a hundred years. Nobody in physics has really been able to analyze it mathematically satisfactorily in spite of its importance to the sister sciences. It is the analysis of circulating or turbulent fluids.

We can never be quite clear whether we are referring to the world as it is or to the world as we see it.

It is hard to define something one knows little about

The words "position" and "velocity" of an electron... seemed perfectly well defined... and in fact they were clearly defined concepts within the mathematical framework of Newtonian mechanics. But actually they were not well defined, as seen from the relations of uncertainty. One may say that regarding their position in Newtonian mechanics they were well defined, but in their relation to nature, they were not. This shows that we can never know beforehand which limitations will be put on the applicability of certain concepts by the extension of our knowledge into the remote parts of nature, into which we can only penetrate with the most elaborate tools. Therefore, in the process of penetration we are bound sometimes to use our concepts in a way which is not justified and which carries no meaning. Insistence on the postulate of complete logical clarification would make science impossible. We are reminded... of the old wisdom that one who insists on never uttering an error must remain silent.

the real problem is a lack of clarity and definition about what a project really is,

Thus, even now, three and a half centuries after Galileo... it is still remarkably difficult to say categorically whether the earth moves...

Certain combinations of dimensions produce harmonious results, but since the time of the ancient Greeks no system of design, consistently base on that knowledge, has been formulated.

[S]uppose that the Emperor Karl V. had said to the learned of his day: "I want a method by which I can send a message in a few seconds to that new world, which my mariners take weeks in reaching. ..." ...It required centuries spent in the discovery and classification of new facts before the Atlantic cable became a possibility. It may require the like or even a longer time to unriddle... psychical and biological enigmas... but he who declares that they can never be solved by the scientific method is... as rash as the man of the early sixteenth century would have been had he declared it utterly impossible that the problem of talking across the Atlantic Ocean should ever be solved.

For all of our complaining about the term, knowledge workers have no agreed-upon definition of what ‘productivity’ even means.

THERE IS AS YET INSUFFICIENT DATA FOR A MEANINGFUL ANSWER.

Economics, even classical economics, is not a finished business. There are still issues relevant to the present debate that have not been definitively explored.

THE PROBLEM IS THAT HARDLY ANYONE IS DECIDING WHAT'S IMPORTANT AND WHAT'S NOT, DAMMIT!