The best way to send information is to wrap it up in a person.

The open society, the unrestricted access to knowledge, the unplanned and uninhibited association of men for its furtherance-these are what may make a vast, complex, ever growing, ever changing, ever more specialized and expert technological world, nevertheless a world of human community.

In the material sciences these are and have been, and are most surely likely to continue to be heroic days.

The greatest of the changes that science has brought is the acuity of change; the greatest novelty the extent of novelty.

It is perfectly obvious that the whole world is going to hell. The only possible chance that it might not is that we do not attempt to prevent it from doing so.

The people of this world must unite or they will perish.

If we must live with a perpetual sense that the world and the men in it are greater than we and too much for us, let it be the measure of our virtue that we know this and seek no comfort.