In more than one respect, the exploring of the Solar System and homesteading other worlds constitutes the beginning, much more than the end, of history.

We are, each of us, a multitude. Within us is a little universe.

I promise to question everything my leaders tell me. I promise to use my critical faculties. I promise to develop my independence of thought. I promise to educate myself so I can make my own judgments.

If we say that God has always been, why not save a step and conclude that the universe has always been?

An organism at war with itself is doomed.

Few scientists now dispute that today's soaring levels of carbon dioxide and other gases in the atmosphere will cause global temperature averages to rise by as much as nine degrees Fahrenheit sometime after the year 2000.

Human beings grew up in forests; we have a natural affinity for them. How lovely a tree is, straining toward the sky.