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 rocks are not so close akin to us as the soil; they are one more remove from us; but they lie back of all, and are the final source of all. ... Time, geologic time, looks out at us from the rocks as from no other objects in the landscape.

There is a condition or circumstance that has a greater bearing upon the happiness of life than any other. What is it? Something to do; some congenial work. Take away the occupation of all people and what a wretched world it would be.

The atmosphere of our time is fast being cleared of the fumes and deadly gases that arose during the carboniferous age of theology.

Nature is not benevolent; Nature is just, gives pound for pound, measure for measure, makes no exceptions, never tempers her decrees with mercy, or winks at any infringement of her laws.

Certainly in the United States, you have a constituency in the form of the weapons laboratories, and you also have the branches of the armed services that are involved with nuclear weapons deployment, especially the naval submarine operations and also the air force's land-based ICBM operations. So they have a big lobby in Washington.

Especially in the case of India and Pakistan, it's very clear that significant parts of the elites in both countries view having nuclear weapons as a ticket to prestige.