Our nation is founded on the principal that observance of the law is the eternal safeguard of liberty and defiance of the law is the surest road to tyranny.

No treaty, however much it may be to the advantage of all, however tightly it may be worded, can provide absolute security against the risks of deception and evasion. But it can, if it is sufficiently effective in its enforcement and if it is sufficiently in the interests of its signers, offer far more security and far fewer risks than an unabated, uncontrolled, unpredictable arms race.

Ask not that the journey be easy; ask instead that it be worth it.

There is, of course, a legitimate argument for some limitation upon immigration. We no longer need settlers for virgin lands, and our economy is expanding more slowly than in the nineteenth and early twentieth centuries.

Let us not be blind to our differences-but let us also direct attention to our common interests and to the means by which those differences can be resolved. And if we cannot end our differences, at least we can help make the world safe for diversity. For, in the final analysis, our most common link is that we all inhabit this small planet. We all breathe the same air. We all cherish our children's future. And we are all mortal.

The supreme reality of our time is the vulnerability of our planet.

There can be no progress if people have no faith in tomorrow.