Roger Penrose

What the twentieth century had managed, we could certainly better, and on a grander scale, in our century.

Lake Louise, the pellucid waters of which seemed to lend colour to the sky.

When it’s known – all’s known!

But I am of a species more extraordinary than anything else there ever was.

You have to experience Mars in its majesty to know that to try to alter – to terraform – this ancient place would be wrong.

We should not alter this planet. We must try to alter ourselves.’