Action in war is like movement in a resistant element. Just as the simplest and most natural of movements, walking, cannot easily be performed in water, so in war it is difficult for normal efforts to achieve even moderate results. Carl von Clausewitz
Very important functions can be performed very wastefully and often are. John Kenneth Galbraith
I am attracted only to music which I consider to be better than it can be performed. Therefore I feel (rightly or wrongly) that unless a piece of music presents a problem to me, a never-ending problem, it doesn't interest me too much. Artur Schnabel
Quantum computation is a distinctively new way of harnessing nature. It will be the first technology that allows useful tasks to be performed in collaboration between parallel universes. David Deutsch
This code is indispensable. Be it a case of commerce, industry, politics, religion, war or philanthropy in every concern there is a management function to be performed and for its performance there must be principles, that is to say acknowledged truths regarded as proven on which to rely. Henri Fayol
There is no problem in all mathematics that cannot be solved by direct counting. But with the present implements of mathematics many operations can be performed in a few minutes which without mathematical methods would take a lifetime. Ernst Mach