Thinkers too often disparage men of action in ways that do them no credit.

Those with a gift for action, for their part, often express contempt for those whose gifts are more reflective. Men of action like to say, 'Those who can, do, those who can't, teach,' forgetting that those who teach get to write the history books.

What's distinctively shocking about Machiavelli is that he didn't care. He believed not only that politicians must do evil in the name of the public good, but also that they shouldn't worry about it. He was unconcerned, in other words, with what modern thinkers call 'the problem of dirty hands.'

Commerce has changed the ethics of citizenship and the incentives for national service. America now buys private contractors - we used to call them mercenaries - to do the country's fighting.

I'd always admired the intellectuals who had made the transition into politics - Mario Vargas Llosa in Peru, Vaclav Havel in the Czech Republic, Carlos Fuentes in Mexico - but I knew that many of them had failed, and in any event, I wasn't exactly in their league.

Too often, women are portrayed in two ways: as prizes to be won by men or as damsels in distress.