At The Extremes It Is Difficult To

National Boundaries Are Not Evident When We View The Earth From Space. Fanatical Ethnic Or Religious Or National Chauvinisms Are A Little Difficult To Maintain When We See Our Planet As A Fragile Blue Crescent Fading To Become An Inconspicuous Point Of Light Against The Bastion And Citadel Of The Stars.

If We Continue To Accumulate Only Power And Not Wisdom, We Will Surely Destroy Ourselves.

It Seems Madness To Say, 'we're Worried That They're Going To Become Addicted To Marijuana' -- There's No Evidence Whatever That It's An Addictive Drug, But Even If It Were, These People Are Dying, What Are We Saving Them From?

Since, In The Long Run, Every Planetary Society Will Be Endangered By Impacts From Space, Every Surviving Civilization Is Obliged To Become Spacefaring — Not Because Of Exploratory Or Romantic Zeal, But For The Most Practical Reason Imaginable: Staying Alive.

Books Permit Us To Voyage Through Time, To Tap The Wisdom Of Our Ancestors.