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

I know that I am intelligent, because I know that I know nothing.

Man is the only creature that refuses to be what he is.

One man's ways may be as good as another's, but we all like our own best.

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.