Do good to your friend to keep him, and to your enemy to make him your freind.

One ofthe lessons of history is that nothing is often a good thing to do and alwaysa clever thing to say.

Every age thinks its battle the most important of all.

Whetherit's the best of times or the worst of times, it's the only time we've got.

Nevermiss a good chance to shut up.

Words are, of course, the most powerful drug used by mankind.

Facts do not cease to exist because they are ignored.

Thefreedom of the city is not negotiable. We cannot negotiate with those whosay, What’s mine is mine and what’s yours is negotiable.

People whoare too concerned with how well they are doing will be less successful andfeel less competent than those who focus on the task itself... Somepsychologists call it a conflict between egoorientation, or between extrinsicand intrinsic motivation...

Only few men think, but all have opinions.

Sciencecannot resolve moral conflicts, but it can help to more accurately frame thedebates about those conflicts.

Neverforget the power of silence, that massively disconcerting pause which goes onand on and may at last induce an opponent to babble and backtrack nervously.