After all, for mankind as a whole there are no exports. We did not start developing by obtaining foreign exchange from Mars or the moon. Mankind is a closed society.

By means of trees, wildlife could be conserved, pollution decreased, and the beauty of our landscapes enhanced. This is the way, or at least one of the ways, to spiritual, moral, and cultural regeneration.

I think I should not go far wrong if I asserted that the amount of genuine leisure available in a society is generally in inverse proportion to the amount of labor-saving machinery it employs.

The technology of mass production is inherently violent, ecologically damaging, self-defeating in terms of non-renewable resources, and stultifying for the human person.

There is incredible generosity in the potentialities of Nature. We only have to discover how to utilize them.

If I limit myself to knowledge that I consider true beyond doubt, I minimize the risk of error but I maximize, at the same time, the risk of missing out on what may be the subtlest, most important and most rewarding things in life.

The best aid to give is intellectual aid, a gift of useful knowledge. A gift of knowledge is infinitely preferable to a gift of material things.