Health is the soul that animates all the enjoyments of life, which fade and are tasteless without it.

As we look ahead into the next century, leaders will be those who empower others.

Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged.

The math is dead simple: it seems that the frequency of planets able to support life is roughly one percent. In other words, a billion or more such worlds exist in our galaxy alone. That's a lot of acreage, and it takes industrial-strength credulity to believe it's all bleakly barren.

Do not turn back when you are just at the goal.