I am in love with this world. It has been my home. It has been my point of outlook into the universe. I have never bruised myself against it nor tried to use it ignobly.

To see Earth fully we already need to love it

There tends to be this comfortable assumption that nuclear weapons won't be used, but I don't think that's warranted, and I think we should seize the opportunity of this time of stability and cooperation and move towards global elimination of nuclear weapons as indeed people like Henry Kissinger, and William Perry, former Secretary of Defense under Clinton, and Sam Nunn, former Senator, and George Schultz, former Undersecretary of State for Ronald Reagan. All of them recently called for achievement of a nuclear weapon-free world.

The floating vapour is just as true an illustration of the law of gravity as the falling avalanche.

It is always easier to believe than to deny. Our minds are naturally affirmative.

One summer day, while I was walking along the country road on the farm where I was born, a section of the stone wall opposite me, and not more than three or four yards distant, suddenly fell down. Amid the general stillness and immobility about me the effect was quite startling. ... It was the sudden summing up of half a century or more of atomic changes in the material of the wall. A grain or two of sand yielded to the pressure of long years, and gravity did the rest.

Man is, and always has been, a maker of gods. It has been the most serious and significant occupation of his sojourn in the world.