Don't be put off by people who know what is not possible. Do what needs to be done, and check to see if it was impossible only after you are done.

I'd rather fail at something important than succeed at something trivial.

The most unrealistic person in the world is the cynic, not the dreamer.

We assume that everything's becoming more efficient, and in an immediate sense that's true; our lives are better in many ways. But that improvement has been gained through a massively inefficient use of natural resources.

Working for the earth is not a way to get rich, it is a way to be rich.

Always leave enough time in your life to do something that makes you happy, satisfied, even joyous. That has more of an effect on economic well-being than any other single factor.

If, as is natural, you focus on the corruption and on those threatened institutions that are trying to prevent change - even though they don't really know what they're trying to prevent - then you can get pessimistic.