"The law must be stable, but it must not stand still"?
A. Roscoe Conkling, influential 19th century US Senator from NY
B. Roscoe Pound, former Dean of Harvard law School
C. Ezra Pound, American expatriate poet
D. Paula Poundstone, comedienne
The answer, of course, at least according to SearchQuotes, is Paula Poundstone. (see screen shot below)
If it's on the internet it must be correct, right? Here is an example to share with students about double-checking sources.
The real answer, as most readers will know, and as most internet sites state correctly, is Roscoe Pound.