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- I mean, don't forget the earth's about five thousand million years old, at least. Who can afford to live in the past? — Harold Pinter
- Does wisdom perhaps appear on the earth as a raven which is inspired by the smell of carrion? — Friedrich Nietzsche
- What, sir, would the people of the earth be without woman? They would be scarce, sir, almighty scarce. — Mark Twain
- Science is a way of thinking much more than it is a body of knowledge. — Carl Sagan
- Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. — Carl Sagan
- Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense. — Carl Sagan