There's a quote about the relationship between physicist, mathematicians/engineers that I'm blanking on and have been trying to find/remember -- it goes somethi

There's a quote about the relationship between physicist, mathematicians/engineers that I'm blanking on and have been trying to find/remember -- it goes something like this: Physicists are concerned with discovering and understanding the fundamental laws underpinning the structure of things while mathematicians/engineers are interested in discovering all the possible worlds that could follow from the fundamental laws physicists discover. Does anyone here remember how that goes?