There is always a cause for fear. The cause may change over time, but the fear is always with us.

You think you can destroy the planet? What intoxicating vanity. . . . . We've been residents here for the blink of an eye. If we're gone tomorrow, the earth will not miss us.

And entertainment has nothing to do with reality. Entertainment is antithetical to reality.

Reality is always greater - much greater - than what we know, than whatever we can say about it.

Let's be clear. The planet is not in jeopardy. We are in jeopardy. We haven't got the power to destroy the planet - or to save it. But we might have the power to save ourselves.

It is especially difficult for modern people to conceive that our modern, scientific age might not be an improvement over the prescientific period.

If you don't know history, then you don't know anything. You are a leaf that doesn't know it is part of a tree.