Did Wigner actually say this?

It is folklore that Eugene Wigner said

"It is nice to know that the computer understands the problem. But I would like to understand it too."

But did he actually say it? Where and when?

I have been trying to track it down. The earliest reference I can find is in the beginning of Chapter 5 of a 1992 book by Nussenzweig, which just says it is attributed to Wigner.

It is a great quote so it would be nice to know that Wigner actually said. I welcome any more information.