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

I knew I belonged to the public and to the world, not because I was talented or even beautiful, but because I had never belonged to anything or anyone else.

Man, alone, has the power to transform his thoughts into physical reality; man, alone, can dream and make his dreams come true.

We shall see but a little way if we require to understand what we see.

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.