Now there is one outstandingly important fact regarding Spaceship Earth, and that is that no instruction book came with it.

Of course, our failures are a consequence of many factors, but possibly one of the most important is the fact that society operates on the theory that specialization is the key to success, not realizing that specialization precludes comprehensive thinking.

Nature is trying very hard to make us succeed, but nature does not depend on us. We are not the only experiment.

We need not to be let alone. We need to be really bothered once in a while. How long is it since you were really bothered? About something important, about something real?

I think a hero is an ordinary individual who finds strength to persevere and endure in spite of overwhelming obstacles.

It is impossible that anything so natural, so necessary, and so universal as death, should ever have been designed by Providence as an evil to mankind.

I believe that God has planted in every human heart the desire to live in freedom. And even when that desire is crushed by tyranny for decades, it will rise again.

Every nation in every region now has a decision to make. Either you are with us, or you are with the terrorists.

We have learned that terrorist attacks are not caused by the use of strength; they are invited by the perception of weakness. And the surest way to avoid attacks on our own people is to engage the enemy where he lives and plans. We are fighting that enemy in Iraq and Afghanistan today so that we do not meet him again on our own streets, in our own cities.

Whether we bring our enemies to justice or bring justice to our enemies, justice will be done.