“The gates made of lightswing open. You see in.”

“More gates you open, more worlds you discover! More worlds you discover, more gates are opened!”

“For certain, neither of them sees a happy Present, as the gate opens and closes, and one goes in, and the other goes away.”

“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.”

“To every man is given the key to the gates of heaven. The same key opens the gates of hell. And so it is with science.”

“Love is the master-key that opens the gates of happiness, of hatred, of jealousy, and, most easily of all, the gate of fear.”