"We no longer have to search for a name for the post-Cold War era. It will henceforth be known as the age of terrorism. Organized terror has shown what it can do; execute the single greatest massacre in American history, shut down the greatest power on the globe and send its leaders into underground shelters. All this, without even resorting to chemical, biological or nuclear weapons of mass destruction. This is a formidable enemy. To dismiss it as a bunch of cowards perpetrating senseless acts of violence is complacent nonsense. People willing to kill thousands of innocents while they kill themselves are not cowards. They are deadly, vicious warriors and need to be treated as such. Nor are their acts of violence senseless. They have a very specific aim: to avenge alleged historical wrongs and to bring the great American satan to its knees."

“Courage is not a quality one normally associates with mathematicians. Yet it should apply to people who work in their attics in secret for seven years without cease on a problem that has eluded the greatest mathematical minds since first proposed in 1637.”

“Science has everything to say about what is possible. Science has nothing to say about what is permissible.”

“When under attack, no country is obligated to collect permission slips from allies to strike back.”

“In an essay 10 years ago, I pointed out that it is utterly logical for polygamy rights to follow gay rights. After all, if traditional marriage is defined as the union of two people of opposite gender, and if, as advocates of gay marriage insist, the gender requirement is nothing but prejudice, exclusion and an arbitrary denial of one's autonomous choices in love, then the first requirement — the number restriction — is a similarly arbitrary, discriminatory and indefensible denial of individual choice.”

“Affluent enviros are all for wind farms, until one is proposed that might mar the serenity of a sail from the crew-necked precincts near Nantucket Sound. Then it's clean energy for thee, not for me.”

“In explaining any puzzling Washington phenomenon, always choose stupidity over conspiracy, incompetence over cunning. Anything else gives them too much credit.”