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Twelfth Night,
Act 3, Scene 2, lines 42-43.

Note to Twelfth Night, 3.2.42-43, "It is no matter how witty, so it be eloquent and full of invention."

Sir Toby is toying with Sir Andrew. Since Sir Andrew has a dim idea that he himself may not too smart, Sir Toby reassures him that his letter doesn't have to be witty, but then he adds that the letter should be "eloquent and full of invention"—that is, extremely witty.

David Schramm and Jordan Coughtry as
Sir Toby and Sir Andrew, 2011
Sir Toby and Sir Andrew