It is an acknowledged truth in philosophy that a just theory will always be confirmed by experiment.

The power of population is indefinitely greater than the power in the earth to produce subsistence for man.

I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.

In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known.

When I moved to Minnesota, I found there was a thriving and determined movement, a grassroots movement, to revitalize the Ojibwe language. And I've never come to be a competent speaker. I have to say that right now. But even learning the amount of Ojibwe that one can at my age is a life-altering experience.

Perhaps life had a meaning that transcended race and colour. If it had, I could not find it in South Africa.

I've learned the dangerous lesson of the web: You succeed by giving up control, and that's inverse of the normal campaign.

Ninety percent of my mentors have been male, most of them with very little in common with me on a personal level - from life experience, work experience, backgrounds, etc.