“The poverty fighters resent the climate-change folks; climate folks hold summits without reference to biodiversity; the food advocates resist the biodiversity protectors.They all need to go on safari together.”

“In my world, you don’t get to call yourself “pro-life” and be against common-sense gun control — like banning public access to the kind of semiautomatic assault rifle, designed for warfare, that was used recently in a Colorado theater. You don’t get to call yourself “pro-life” and want to shut down the Environmental Protection Agency, which ensures clean air and clean water, prevents childhood asthma, preserves biodiversity and combats climate change that could disrupt every life on the planet. You don’t get to call yourself “pro-life” and oppose programs like Head Start that provide basic education, health and nutrition for the most disadvantaged children...The term “pro-life” should be a shorthand for respect for the sanctity of life. But I will not let that label apply to people for whom sanctity for life begins at conception and ends at birth. What about the rest of life? Respect for the sanctity of life, if you believe that it begins at conception, cannot end at birth.”

“It has always been my view that terrorism is not spawned by the poverty of money; it is spawned by the poverty of dignity. Humiliation is the most underestimated force in international relations and in human relations. It is when people or nations are humiliated that they really lash out and engage in extreme violence.”

“When Muslim radicals and fundamentalists look at the West, they see only the openness that makes us, in their eyes, decadent and promiscuous. They see only the openness that has produced Britney Spears and Janet Jackson. They do not see, and do not want to see, the openness - the freedom of thought and inquiry - that has made us powerful, the openness that has produced Bill Gates and Sally Ride. They deliberately define it all as decadence. Because if openness, women's empowerment, and freedom of thought and inquiry are the real sources of the West's economic strength, then the Arab-Muslim world would have to change. And the fundamentalists and extremists do not want to change.”

“So what am I? I guess I would call myself a sober optimist...If you are not sober about the scale of the challenge, then you are not paying attention. But if you are not an optimist, you have no chance of generating the kind of mass movement needed to achieve the needed scale.”

“ No policy is sustainable without a public that broadly understands why it's necessary and sees the world the way you do...”

“When widely followed public figures feel free to say anything, without any fact-checking, it becomes impossible for a democracy to think intelligently about big issues.”