I'm here to chew gum and kick some ass, and I'm all out of gum.

Mankind's greatest achievements have come about by talking and its greatest failures by not talking. It doesn’t have to be like this.

If we can avoid disaster for the next two centuries, our species should be safe as we spread into space. If we are the only intellegent beings in the galaxy we should make sure we survive and continue. . . . Our only chance of long-term survival is not to remain inward looking on planet Earth but to spread out into space. We have made remarkable progress in the last hundred years. But if we want to continue beyond the next hundred years, our future is in space.

There should be a better way to start a day than waking up every morning.

The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something you can do, and succeed at. While there's life, there is hope.

I think computer viruses should count as life ... I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image.

The human capacity for guilt is such that people can always find ways to blame themselves