If one is physically disabled, one cannot afford to be psychologically disabled as well.

It is tribute to how far we have come in theoretical physics that it now takes enormous machines and a great deal of money to perform experiments whose results we can not predict.

The intelligent beings in these regions should therefore not be surprised if they observe that their locality in the universe satisfies the conditions that are necessary for their existence. It is a bit like a rich person living in a wealthy neighborhood not seeing any poverty.

I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.

Doing a job RIGHT the first time gets the job done. Doing the job WRONG fourteen times gives you job security.

There is a very real danger that we will kill everything on this planet now that we have the technological power to do so.

So next time someone complains that you have made a mistake, tell him that may be a good thing. Because without imperfection, neither you nor I would exist.