Asimov(?) Eureka quote

There is a quote often attributed to Isaac Asimov. It keeps on coming up in lists of his sayings. Does anyone know in which article he wrote this, or if not Asimov who did say it?

There are several slightly different versions, but it goes like this:

Anyone have the origin?

I believe this was an Asimov quote. The source which is coming to my forebrain at the moment is the novel The Gods Themselves. I’ll see if I can find my copy and get a definite source citation for you.

Enjoy,
Steven

Can I bump this one.

Did you find your copy, Steven? Was the quote there?