If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

Man is, perhaps, no more prone to war than he used to be and no more inclined to commit other evil deeds. But a given amount of ill will or folly will go further than it used to.

Both the cockroach and the bird would get along very well without us, although the cockroach would miss us most.

To be individually righteous is the first of all duties, come what may to ones self, to one's country, to society, and to civilization itself.

Technology made large populations possible; large populations now make technology indispensable.

Every time a value is born, existence takes on a new meaning; every time one dies, some part of that meaning passes away.

In our hearts those of us who know anything worth knowing know that in March a new year begins, and if we plan any new leaves, it will be when the rest of Nature is planning them too.