What does this quote mean?

Guest   Wed Mar 12, 2008 5:11 am GMT
“Ideas are a commodity. Execution of them is not.”
Guest   Wed Mar 12, 2008 12:11 pm GMT
It's easy to come up with ideas, but much tougher to turn them into reality.

Example: I've just come up with a brilliant idea of instantaneous communication across arbitrary distances (faster than the speed of light). The tough part is building devices that can do that, so I'll just leave that part up to you.

BTW -- If you succeed, there's probably a Nobel Prize in it for you.