Stephen Hawking's A Brief History of Time tells the story of a cosmologist whose speech is interrupted by a little old lady who informs him that the universe rests on the back of a turtle. Ah, yes, madame, the scientist replies, but what does the turtle rest on? The old lady shoots back: You can't trick me, young man. It's nothing but turtles, turtles, turtles, all the way down.

In the annals of American blunders, the Bay of Pigs may have been even more feckless, and the invasion of Iraq more costly, but we cannot yet calculate the cost of teaching Iran and others, by our role in the casual overthrow of Moammar Gaddafi, the peril of not having nuclear weapons.

Long before Einstein told us that matter is energy, Machiavelli and Hobbes and other modern political philosophers defined man as a lump of matter whose most politically relevant attribute is a form of energy called "self-interestedness". This was not a portrait of man "warts and all". It was all wart - except that the dominating attribute was not considered a blemish.

Republicans, supposed defenders of limited government, actually are enablers of an unlimited presidency. Their belief in strict construction of the Constitution evaporates, and they become, in behavior if not in thought, adherents of the woolly idea of a 'living Constitution.' They endorse, by their passivity, the idea that new threats justify ignoring the Framers' text and logic about shared responsibility for war-making.

I say statecraft is soulcraft. Just as all education is moral education because learning conditions conduct, most legislation is moral legislations because it conditions the action and the thought of the nation in broad and important spheres in life.

Man is messy, but any creature that can create space vehicles can probably cope.

Greek philosophers considered sport a religious and civic-in a word, moral-undertaking. Sport, they said, is morally serious because mankind's noblest aim is the loving contemplation of worthy things, such as beauty and courage.