Part of the reasons I have lived the life I have is because I wanted to have an adventurous life. But my best adventures are more literary than political.

As we begin to have landings on the moon, we can alternate those with vertical launch of similar crew modules on similar launch vehicles for vertical-launch tourism in space, if you want to call it that... adventure travel.

The old wanderlust had gotten into his blood, the joy of the unbound life, the joy of seeking, of hoping without limit.

Adventure is a path. Real adventure - self-determined, self-motivated, often risky - forces you to have firsthand encounters with the world. The world the way it is, not the way you imagine it. Your body will collide with the earth and you will bear witness. In this way you will be compelled to grapple with the limitless kindness and bottomless cruelty of humankind - and perhaps realize that you yourself are capable of both. This will change you. Nothing will ever again be black-and-white.

There is probably no pleasure equal to the pleasure of climbing a dangerous Alp; but it is a pleasure which is confined strictly to people who can find pleasure in it.

There are people who travel because they want to push themselves to physical limits, people who walk across deserts or cycle across the Antarctic - like Ranulph Fiennes, who just does it because it's there. And then there are people like me, who are just genuinely curious about the world.