I know FM's already answered this, but just thought I'd mention this is one that is easy to fing with search.
Yet Clare's sharp questions must I shun,
Must separate Constance from the nun -
Oh! what a tangled web we weave
When first we practise to deceive!
A Palmer too!- no wonder why
I felt rebuked beneath his eye;
I might have known there was but one
Whose look could quell Lord Marmion.'
~Marmion, Canto 6Sir Walter Scott http://faculty.plattsburgh.edu/peter.friesen/default.asp?go=1111
Oh, what a tangled web site we weave
"Oh, what a tangled web we weave
When first we practice to deceive
But when we've practiced for a while
How vastly we improve our style!"
~ J.R. Pope, A Word of Encouragement:http://www.mindspring.com/~boba4/Perish.html