"It isn't important in which sea or lake you observe a slick of pollution, or in the forests of which country a fire breaks out, or on which continent a hurricane arises. You are standing guard over the whole of our Earth."

"There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no humanity."

"When you're finally up on the moon, looking back at the earth, all these differences and nationalistic traits are pretty well going to blend and you're going to get a concept that maybe this is really one world and why the hell can't we learn to live together like decent people?"

"The love of one's country is a splendid thing. But why should love stop at the border?"

"I am part and parcel of the whole and cannot find God apart from the rest of humanity."

"Our true nationality is mankind."

"There are no boundaries in the real Planet Earth. No United States, no Russia, no China, no Taiwan. Rivers flow unimpeded across the swaths of continents. The persistent tides, the pulse of the sea do not discriminate; they push against all the varied shores on Earth."