Yet weren't all human beings simply human beings no matter what name you applied to them[?] - Isaac Asimov

A weak general could never have endangered us, obviously. A strong general during the time of a weak Emperor would never have endangered us, either; for he would have turned his arms towards a much more fruitful target. Events have shown that three-fourths of the Emperors of the last two centuries were rebel generals and rebel viceroys before they were Emperors. 'So it is only the combination of strong Emperor and strong general that can harm the Foundation; for a strong Emperor can not be dethroned easily, and a strong general is forced to turn outwards, past the frontiers. 'But, what keeps the Emperor strong? What kept Cleon strong? It's obvious. He is strong, because he permits no strong subjects. A courtier who becomes too rich, or a general who becomes too popular is dangerous. All the recent history of the Empire proves that to any Emperor intelligent enough to be strong.

Can entropy ever be reversed?
"We both know entropy can't be reversed. You can't turn smoke and ash back into a tree."
"Do you have trees on your world?"
The sound of the Galactic AC startled them into silence. Its voice came thin and beautiful out of the small AC-contact on the desk. It said: "THERE IS INSUFFICIENT DATA FOR A MEANINGFUL ANSWER"

The whole war is a battle between those two systems; between the Empire and the Foundation; between the big and the little. To seize control of a world, they bribe with immense ships that can make war, but lack all economic significance. We, on the other hand, bribe with little things, useless in war, but vital to prosperity and profits. 'A king, or a Commdor, will take the ships and even make war. Arbitrary rulers throughout history have bartered their subjects' welfare for what they consider honour, and glory, and conquest. But it's still the little things in life that count – and Asper Argo won't stand up against the economic depression that will sweep all Korell in two or three years.