I would give ten years off the beginning of my life to see, only once, Tyrannosaurus rex come rearing up from the elms of Central Park, a Morgan police horse screaming in its jaws. We can never have enough of nature.

Epitaphs for a gravestone: 'Please: no hooliganism'; or 'Es prohibe se hace agua aqui'; or 'No comment'.

In history-as-politics, the 'future' is that vacuum in time waiting to be filled with the antics of statesmen.

We can have wilderness without freedom; we can have wilderness without human life at all, but we cannot have freedom without wilderness, we cannot have freedom without leagues of open space beyond the cities, where boys and girls, men and women, can live at least part of their lives under no control but their own desires and abilities, free from any and all direct administration by their fellow men.

Growth for the sake of growth is the ideology of the cancer cell.

Why I oppose the nuclear-arms race: I prefer the human race.

One must be reasonable in one's demands on life. For myself, all that I ask is: (1) accurate information; (2) coherent knowledge; (3) deep understanding; (4) infinite loving wisdom; (5) no more kidney stones, please.