Culture means the perfect and equal development of man on all sides.

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.

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.

It doesn't seem to be that huge a commitment that would create, you know, some kind of really powerful constituency. But the history has been for the United States and Russia especially that nuclear weapons have kind of become part of the identity of the countries.

[T]he cold warms me—after a different fashion from that of the kitchen stove.

When you bait your hook with your heart, the fish always bite.

Travel and society polish one, but a rolling stone gathers no moss, and a little moss is a good thing on a man.