The gift of perfume to a flower is a special grace like genius or like beauty, and never becomes common or cheap.

If you want to see birds, you must have birds in your heart.

The poor old earth which has mothered us and nursed us we treat with scant respect. Our awe and veneration we reserve for the worlds we know not of. Our senses sell us out. The mud on our shoes disenchants us.

Science makes no claim to infallibility; it leaves that claim to be made by theologians.

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

The five original nuclear weapon states I mentioned - U.S., Britain, France, China, and Russia - under the NPT have committed to the achievement of the elimination of their nuclear arsenals through good faith negotiations of nuclear disarmament - that's Article Six of the treaty.

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.