We all share one planet and are one humanity; there is no escaping this reality.

Our country is the world — our countrymen are all mankind.

The only truly alien planet is Earth.

A new consciousness is developing which sees the earth as a single organism and recognizes that an organism at war with itself is doomed. We are one planet. One of the great revelations of the age of space exploration is the image of the earth finite and lonely, somehow vulnerable, bearing the entire human species through the oceans of space and time.

One country, one constitution, one destiny.

Any planet is 'Earth' to those that live on it.

The Earth is what we all have in common.

I have no country to fight for; my country is the earth; I am a citizen of the world.

This whole earth in which we inhabit is but a point is space.

To all general purposes we have uniformly been one people each individual citizen everywhere enjoying the same national rights, privileges, and protection.

For all the contradictions of the present-day world, for all the diversity of social and political systems in it, and for all the different choices made by the nations in different times, this world is nevertheless one whole. We are all passengers aboard one ship, the Earth, and we must not allow it to be wrecked. There will be no second Noah's Ark.

Our true nationality is mankind.

The Earth is the only world known so far to harbour life. There is nowhere else, at least in the near future, to which our species could migrate. Visit? Yes. Settle? Not yet. Like it or not, for the moment, the Earth is where we make our stand. It has been said that astronomy is a humbling and character-building experience. ... To me, it underscores our responsibility to deal more kindly with one another and to preserve, and cherish, the pale blue dot; the only home we've ever known.

"We say "inner world" or "outer world," but actually there is just one whole world."