It is change continuing change, inevitable change that is the dominant factor in society today.

When I read about the way in which library funds are being cut and cut, I can only think that American society has found one more way to destroy itself.

However, I continue to try and I continue, indefatigably, to reach out. There's no way I can single-handedly save the world or, perhaps, even make a perceptible difference - but how ashamed I would be to let a day pass without making one more effort.

When people thought the earth was flat, they were wrong. When people thought the earth was spherical, they were wrong. But if you think that thinking the earth is spherical is just as wrong as thinking the earth is flat, then your view is wronger than both of them put together.

Humanity is cutting down its forests, apparently oblivious to the fact that we may not be able to live without them.

Many a prophecy, by the mere force of its being believed, is transmuted to fact.

A subtle thought that is in error may yet give rise to fruitful inquiry that can establish truths of great value.