Our children may save us if they are taught to care properly for the planet; but if not, it may be back to the Ice Age or the caves from where we first emerged. Then we'll have to view the universe above from a cold, dark place.

Then you notice the cherry blossoms, and you see that nature is unaffected by all this. Poplar trees, the red butterflies, the fragile beauty of flowers, the sun-you see how nature is indifferent to it all.

We behold the face of nature bright with gladness.

He who is not content to look, like a savage, at the phenomena of nature as disconnected, cannot any longer believe that man is the work of a separate act of creation ... Man is the co-descendant with other mammals of a common progenitor.

Nature knows no indecencies; man invents them.

A man who keeps company with glaciers comes to feel tolerably insignificant by and by.