«In a sense, each of us is an island. In another sense, however, we are all one. For though islands appear separate, and may even be situated at great distances from one another, they are only extrusions of the same planet, Earth.»

«We will look upon the earth and her sister planets as being with us, not for us. One does not rape a sister.»

«It suddenly struck me that that tiny pea, pretty and blue, was the Earth. I put up my thumb and shut one eye, and my thumb blotted out the planet Earth. I didn't feel like a giant. I felt very, very small.»

«I put up my thumb... and it blotted out the planet Earth.»

«Man is a microcosm, or a little world, because he is an extract from all the stars and planets of the whole firmament, from the earth and the elements; and so he is their quintessence»

«The Earth is the most powerful and energetic planet.»

«Next to reasoning, the greatest handicap to the optimum development of Man lies in the fact that this planet is just barely habitable. Its minimum temperatures are too low, and its maximum temperatures too high. Its day is not long enough, and its night is too long. The disposition of its water and earth is distinctly unfortunate (the existence of the Mediterranean Sea in the place where we find it is perhaps the unhappiest accident in the whole firmament). These factors encourage depression, fear, war, and lack of vitality. They describe a planet, which is by no means perfectly devised for the nurturing or for the perpetuation of a higher intelligence.»

«This whole earth which we inhabit is but a point in space. How far apart, think you, dwell the two most distant inhabitants of yonder star, the breadth of whose disk cannot be appreciated by our instruments? Why should I feel lonely? Is not our planet in the Milky Way? This which you put seems to me not to be the most important question. What sort of space is that which separates a man from his fellows and makes him solitary? I have found that no exertion of the legs can bring two minds much nearer to one another.»

«I couldn't help but say to [Mr. Gorbachev], just think how easy his task and mine might be in these meetings that we held if suddenly there was a threat to this world from another planet. [We'd] find out once and for all that we really are all human beings here on this earth together.»

«To put it country simple. Earth has a lot of things other folks might want, like the whole planet. And maybe these folks would like a few changes made.»