“Pessimists are usually right and optimists are usually wrong but all the great changes have been accomplished by optimists.”

“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.”

“For optimists, human life never needs justification, no matter how much hurt piles up, because they can always tell themselves that things will get better. For pessimists, there is no amount of happiness—should such a thing as happiness even obtain for human beings except as a misconception—that can compensate us for life’s hurt. As a worst-case example, a pessimist might refer to the hurt caused by some natural or human-made cataclysm. To adduce a hedonic counterpart to the horrors that attach to such cataclysms would require a degree of ingenuity from an optimist, but it could be done. And the reason it could be done, the reason for the eternal stalemate between optimists and pessimists, is that no possible formula can be established to measure proportions and types of hurt and happiness in the world. If such a formula could be established, then either pessimists or optimists would have to give in to their adversaries.”

“One of the newest figures to emerge on the world stage in recent years is the social entrepreneur. This is usually someone who burns with desire to make a positive social impact on the world, but believes that the best way of doing it is, as the saying goes, not by giving poor people a fish and feeding them for a day, but by teaching them to fish, in hopes of feeding them for a lifetime. I have come to know several social entrepreneurs in recent years, and most combine a business school brain with a social worker's heart. The triple convergence and the flattening of the world have been a godsend for them. Those who get it and are adapting to it have begun launching some very innovative projects.”

“That's right-the striking thing about greenhouse gases is the diversity of sources that emit them. A herd of cattle belching can be worse than highway full of hummers.”

“Optimists are usually inexperienced.”

“The saying in China is "If you're one in a million, there's still 1,300 people just like you.”