There's no difference between a pessimist who says, "Oh it's hopeless, so don't bother doing anything." and an optimist who says, "Don't bother doing anything, it's going to turn out fine anyways. Either way, nothing happens."

It's not an adventure until something goes wrong.

Nature doesn't like empires. It doesn't like accumulation in one place, it doesn't like monoculture. It's always trying to make diverse species. It wants to spread everything out. And we're constantly trying to hold everything in.

The rules of the game must be constantly updated to keep up with the expanding technology. Otherwise we overkill the classic climbs and delude ourselves into thinking we are better climbers than the pioneers.

Yeah, leading an examined life, I always say, is a pain in the ass. It adds an element of complexity to business that most businessmen don't want to hear about. They just want to call a fabric manufacturer, and say, "Hey, give us 10,000 yards of shirting."

Traveling is my form of self-education. Every stream I fish now is not as good as it used to be. Traveling is my form of self-education. Every stream I fish now is not as good as it used to be. If you keep your eyes open as you travel around, you realize we are destroying this planet.

I've accepted the fact that there's a beginning and end to everything. All species are born, evolve, and then die off. We're going through the 6th great extinction and the large mammals are going first and, you know what - we're large mammals!