"Let us not forget it is a Constitution we are expounding"

I’m trying to track down the above quotation (quoted from memory, so I may not have got it quite right). In which decision did Chief Justice Marshall say that?

http://www.louisville.edu/~tcmack01/316syl.html says it was John Marshall. (I just left off the “Let us not forget” part.)

McCulloch v. Maryland, 17 U.S. (4 Wheat.) 316, 407 (1819)

–Cliffy

Great! Thanks, Cliffy.

Oh, yes!
Expound me!
Expound me!

It’s also sometimes spelled M’Culloch, which is good to know if you’re researching secondary sources.

–Cliffy