And most importantly, the next time someone asks you "Who are you?" you must answer in this simple way, with sincerity and conviction: "I am an Earth Citizen

Let us give future generations the gift of Earth citizenship by first giving it to ourselves.

There was once a time when darkness shrouded the world, and the darkness had a queen.

I alternate between thinking of the planet as home - dear and familiar stone hearth and garden - and as a hard land of exile in which we are all sojourners.

To bear is to conquer our fate.

We work to become, not to acquire.

I don't like to read novels where the novelist tells me what to think about the situation and the characters. I prefer to discover for myself.

The man who is not afraid of danger is not a hero, but a psychopath.

I hate gold. It does not pay a dividend, it has no value, and you can't work out what it should or shouldn't be worth," he said. "It is the last refuge of the desperate.

You have to be open to everything.

[P]ride is something only folk with money can afford.

Far from being magisterial in its objectivity, science was conditioned by history, society, and the prejudices of scientists.