I think my inner voices are pretty good when it comes to warning of trouble. The problem is, I don’t always… — Charles Sheffield

As usual he looked tired, but that was normal. Geniuses worked harder than anyone else, not less hard.

The mills of bureaucracy may or may not grind fine, but they certainly grind exceeding slow.

If I’ve learned one thing wandering around inside and outside the Solar System, it’s this: Nature has more ways of killing you than you can imagine. When you think you’ve learned them all, another one pops up to teach you humility—if you’re lucky. If not, someone else will have to decide what did you in.