I have discovered the secret of happiness - it is work, either with the hands or the head. The moment I have something to do, the draughts are open and my chimney draws, and I am happy.

The fuel in the earth will be exhausted in a thousand or more years, and its mineral wealth, but man will find substitutes for these in the winds, the waves, the sun's heat, and so forth.

The art of nature is all in the direction of concealment.

The countries outside the Non-Proliferation Treaty also are bound by that obligation [ Article Six of the treaty] according to, at least it's a strong implication of, a 1996 opinion of the International Court of Justice.

Unfortunately, nuclear weapons have become identified with state power.

Serene, I fold my hands and wait, Nor care for wind, nor tide, nor sea; I rave no more 'gainst time or fate, For lo! my own shall come to me.

The rocks have a history; gray and weatherworn, they are veterans of many battles; they have most of them marched in the ranks of vast stone brigades during the ice age; they have been torn from the hills, recruited from the mountaintops, and marshaled on the plains and in the valleys; and now the elemental war is over, there they lie waging a gentle but incessant warfare with time and slowly, oh, so slowly, yielding to its attacks!